SEC Info℠  
    Home      Search      My Interests      Help      Sign In      Please Sign In
 
We’re going down soon, to move to a new Data Center today.  We’ll be up ASAP.  Sorry.

Alarm.com Holdings, Inc. – ‘10-Q’ for 3/31/20 – ‘JSON’

On:  Thursday, 5/7/20, at 5:24pm ET   ·   For:  3/31/20   ·   Accession #:  1459200-20-12   ·   File #:  1-37461

Previous ‘10-Q’:  ‘10-Q’ on 11/5/19 for 9/30/19   ·   Next:  ‘10-Q’ on 8/5/20 for 6/30/20   ·   Latest:  ‘10-Q’ on 5/10/24 for 3/31/24   ·   4 References:   

Find Words in Filings emoji
 		  in    Show  and   ↓Hints

  As Of               Filer                 Filing    For·On·As Docs:Size

 5/07/20  Alarm.com Holdings, Inc.          10-Q        3/31/20   97:9.6M

Quarterly Report   —   Form 10-Q   —   Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        10-Q Alarm.Com Holdings, Inc. March 31, 2020        HTML   1.38M 
 2: EX-10.1     Exhibit 10.1 Ninth Amendment to Office Lease        HTML     97K 
 3: EX-31.1     Exhibit 31.1 Certification 3.31.20                  HTML     34K 
 4: EX-31.2     Exhibit 31.2 Certification 3.31.20                  HTML     34K 
 5: EX-32.1     Exhibit 32.1 Certification 3.31.20                  HTML     32K 
84: R1          Cover Page                                          HTML     82K 
38: R2          Condensed Consolidated Statements of Operations     HTML    106K 
24: R3          Condensed Consolidated Balance Sheets               HTML    119K 
58: R4          Condensed Consolidated Balance Sheets               HTML     57K 
                (Parenthetical)                                                  
83: R5          Condensed Consolidated Statements of Cash Flows     HTML    118K 
36: R6          Condensed Consolidated Statements of Equity         HTML     77K 
21: R7          Organization                                        HTML     30K 
56: R8          Basis of Presentation and Summary of Significant    HTML     63K 
                Accounting Policies                                              
86: R9          Revenue from Contracts with Customers               HTML     65K 
89: R10         Accounts Receivable, Net                            HTML     48K 
59: R11         Inventory, Net                                      HTML     35K 
19: R12         Acquisitions                                        HTML     63K 
32: R13         Goodwill and Intangible Assets, Net                 HTML     87K 
90: R14         Other Assets                                        HTML    137K 
60: R15         Fair Value Measurements                             HTML     85K 
20: R16         Leases                                              HTML     53K 
33: R17         Liabilities                                         HTML     43K 
88: R18         Debt, Commitments and Contingencies                 HTML     65K 
61: R19         Stockholders' Equity                                HTML     31K 
16: R20         Stock-Based Compensation                            HTML     50K 
53: R21         Earnings Per Share                                  HTML     50K 
81: R22         Significant Service Providers                       HTML     31K 
73: R23         Income Taxes                                        HTML     35K 
17: R24         Segment Information                                 HTML     87K 
54: R25         Related Party Transactions                          HTML     34K 
82: R26         Basis of Presentation and Summary of Significant    HTML    101K 
                Accounting Policies (Policies)                                   
74: R27         Basis of Presentation and Summary of Significant    HTML     35K 
                Accounting Policies (Tables)                                     
18: R28         Revenue from Contracts with Customers (Tables)      HTML     45K 
52: R29         Accounts Receivable, Net (Tables)                   HTML     59K 
35: R30         Inventory, Net (Tables)                             HTML     36K 
26: R31         Acquisitions (Tables)                               HTML     44K 
57: R32         Goodwill and Intangible Assets, Net (Tables)        HTML     87K 
87: R33         Other Assets Other Assets (Tables)                  HTML    128K 
34: R34         Fair Value Measurements (Tables)                    HTML     81K 
25: R35         Leases (Tables)                                     HTML     52K 
55: R36         Liabilities (Tables)                                HTML     44K 
85: R37         Stock-Based Compensation (Tables)                   HTML     47K 
37: R38         Earnings Per Share (Tables)                         HTML     52K 
22: R39         Segment Information (Tables)                        HTML     79K 
46: R40         Organization (Details)                              HTML     27K 
13: R41         Basis of Presentation and Summary of Significant    HTML     48K 
                Accounting Policies - Supplemental Balance Sheet                 
                Information Regarding Leases (Details)                           
72: R42         Revenue from Contracts with Customers - Narrative   HTML     42K 
                (Details)                                                        
80: R43         Revenue from Contracts with Customers - Contract    HTML     44K 
                Asset and Liability Balances (Details)                           
44: R44         Accounts Receivable, Net - Schedule of Components   HTML     37K 
                of Accounts Receivable (Details)                                 
12: R45         Accounts Receivable, Net - Narrative (Details)      HTML     33K 
71: R46         Accounts Receivable, Net - Schedule of Credit       HTML     45K 
                Losses (Details)                                                 
79: R47         Inventory, Net (Details)                            HTML     35K 
47: R48         Acquisitions - Acquisition of a Business (Details)  HTML     68K 
11: R49         Acquisitions - OpenEye - Consideration Paid and     HTML     85K 
                Estimated Fair Value of Assets Acquired (Details)                
27: R50         Acquisitions - Asset Acquisition (Details)          HTML     37K 
40: R51         Goodwill and Intangible Assets, Net - Schedule of   HTML     37K 
                Goodwill (Details)                                               
96: R52         Goodwill and Intangible Assets, Net - Narrative     HTML     37K 
                (Details)                                                        
66: R53         Goodwill and Intangible Assets, Net - Schedule of   HTML     41K 
                Net Carrying Amount of Intangible Assets (Details)               
28: R54         Goodwill and Intangible Assets, Net - Schedule of   HTML     53K 
                Weighted Average Remaining Life and Carrying Value               
                of Finite-Lived Intangible Assets (Details)                      
41: R55         Other Assets - Patent Licenses (Details)            HTML     60K 
97: R56         Other Assets - Loan to a Distribution Partner and   HTML     79K 
                Prepaid Expenses (Details)                                       
67: R57         Other Assets - Loan to a Hardware Supplier          HTML     75K 
                (Details)                                                        
29: R58         Other Assets - Schedule of Notes Receivable Credit  HTML     47K 
                Losses (Details)                                                 
39: R59         Other Assets - Credit Qualtiy Indicators (Details)  HTML     83K 
77: R60         Other Assets - Amortized Cost (Details)             HTML     33K 
68: R61         Other Assets - Allowance For Credit Losses          HTML     42K 
                Narrative (Details)                                              
14: R62         Fair Value Measurements - Schedule of Assets and    HTML     54K 
                Liabilities Measured at Fair Value on Recurring                  
                Basis (Details)                                                  
49: R63         Fair Value Measurements - Summary of Fair Value of  HTML     33K 
                Level 3 Subsidiary Unit Awards and Contingent                    
                Consideration (Details)                                          
78: R64         Fair Value Measurements - Narrative (Details)       HTML     54K 
69: R65         Leases - Narrative (Details)                        HTML     36K 
15: R66         Leases Leases - Supplemental Information Related    HTML     39K 
                to Leases (Details)                                              
50: R67         Leases Leases - Maturities of Lease Liabilities     HTML     49K 
                (Details)                                                        
76: R68         Liabilities - Components of Accounts Payable,       HTML     36K 
                Accrued Expenses, and Other Current Liabilities                  
                (Details)                                                        
70: R69         Liabilities - Other Liabilities (Details)           HTML     36K 
64: R70         Debt, Commitments and Contingencies - Debt          HTML    109K 
                (Details)                                                        
92: R71         Debt, Commitments and Contingencies - Letters of    HTML     32K 
                Credit (Details)                                                 
43: R72         Debt, Commitments and Contingencies - Legal         HTML     40K 
                Proceedings (Details)                                            
31: R73         Stockholders' Equity (Details)                      HTML     36K 
63: R74         Stock-Based Compensation - Stock-Based              HTML     46K 
                Compensation Expense (Details)                                   
91: R75         Stock-Based Compensation - Narrative (Details)      HTML     43K 
42: R76         Earnings Per Share - Components of Basic and        HTML     63K 
                Diluted EPS (Details)                                            
30: R77         Earnings Per Share - Schedule of Securities         HTML     41K 
                Excluded from Calculation of Diluted Weighted                    
                Average Common Shares Outstanding Due to                         
                Anti-dilutive Effect (Details)                                   
62: R78         Significant Service Providers (Details)             HTML     39K 
94: R79         Income Taxes (Details)                              HTML     43K 
65: R80         Segment Information (Details)                       HTML     81K 
93: R81         Related Party Transactions (Details)                HTML     52K 
95: R9999       Uncategorized Items - alarmcom10-qmarch312020.htm   HTML     28K 
51: XML         IDEA XML File -- Filing Summary                      XML    178K 
23: XML         XBRL Instance -- alarmcom10-qmarch312020_htm         XML   2.22M 
45: EXCEL       IDEA Workbook of Financial Reports                  XLSX    104K 
 7: EX-101.CAL  XBRL Calculations -- alrm-20200331_cal               XML    248K 
 8: EX-101.DEF  XBRL Definitions -- alrm-20200331_def                XML    840K 
 9: EX-101.LAB  XBRL Labels -- alrm-20200331_lab                     XML   1.83M 
10: EX-101.PRE  XBRL Presentations -- alrm-20200331_pre              XML   1.15M 
 6: EX-101.SCH  XBRL Schema -- alrm-20200331                         XSD    192K 
48: JSON        XBRL Instance as JSON Data -- MetaLinks              395±   582K 
75: ZIP         XBRL Zipped Folder -- 0001459200-20-000012-xbrl      Zip    391K

‘JSON’   —   XBRL Instance as JSON Data — MetaLinks

This File is an XBRL Instance as JavaScript Object Notation (JSON) Data.


{
"instance":  {
    "alarmcom10-qmarch312020.htm":  {
        "axisCustom":  5,
        "axisStandard":  38,
        "contextCount":  301,
        "dts":  {
            "calculationLink":  {
                "local":  [
                    "alrm-20200331_cal.xml"
                    ]
                },
            "definitionLink":  {
                "local":  [
                    "alrm-20200331_def.xml"
                    ],
                "remote":  [
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-eedm-def-2019-01-31.xml",
                    "http://xbrl.fasb.org/srt/2019/elts/srt-eedm1-def-2019-01-31.xml"
                    ]
                },
            "inline":  {
                "local":  [
                    "alarmcom10-qmarch312020.htm"
                    ]
                },
            "labelLink":  {
                "local":  [
                    "alrm-20200331_lab.xml"
                    ],
                "remote":  [
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-doc-2019-01-31.xml",
                    "https://xbrl.sec.gov/dei/2019/dei-doc-2019-01-31.xml"
                    ]
                },
            "presentationLink":  {
                "local":  [
                    "alrm-20200331_pre.xml"
                    ]
                },
            "referenceLink":  {
                "remote":  [
                    "https://xbrl.sec.gov/dei/2019/dei-ref-2019-01-31.xml",
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-ref-2019-01-31.xml"
                    ]
                },
            "schema":  {
                "local":  [
                    "alrm-20200331.xsd"
                    ],
                "remote":  [
                    "http://xbrl.fasb.org/srt/2019/elts/srt-types-2019-01-31.xsd",
                    "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd",
                    "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd",
                    "http://www.xbrl.org/2003/xl-2003-12-31.xsd",
                    "http://www.xbrl.org/2003/xlink-2003-12-31.xsd",
                    "http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd",
                    "http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd",
                    "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
                    "http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd",
                    "http://www.xbrl.org/2005/xbrldt-2005.xsd",
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd",
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-roles-2019-01-31.xsd",
                    "http://xbrl.fasb.org/srt/2019/elts/srt-roles-2019-01-31.xsd",
                    "https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd",
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-types-2019-01-31.xsd",
                    "http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd",
                    "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
                    "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
                    "https://xbrl.sec.gov/currency/2019/currency-2019-01-31.xsd",
                    "https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd",
                    "https://xbrl.sec.gov/exch/2019/exch-2019-01-31.xsd",
                    "http://xbrl.sec.gov/naics/2017/naics-2017-01-31.xsd",
                    "http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd",
                    "https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd",
                    "http://www.xbrl.org/lrr/role/deprecated-2009-12-16.xsd",
                    "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd",
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-parts-codification-2019-01-31.xsd"
                    ]
                }
            },
        "elementCount":  601,
        "entityCount":  1,
        "hidden":  {
            "http://fasb.org/us-gaap/2019-01-31":  45,
            "http://www.alarm.com/20200331":  8,
            "http://xbrl.sec.gov/dei/2019-01-31":  5,
            "total":  58
            },
        "keyCustom":  45,
        "keyStandard":  347,
        "memberCustom":  42,
        "memberStandard":  47,
        "nsprefix":  "alrm",
        "nsuri":  "http://www.alarm.com/20200331",
        "report":  {
            "R1":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "dei:DocumentType",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "document",
                "isDefault":  "true",
                "longName":  "0001000 - Document - Cover Page",
                "role":  "http://www.alarm.com/role/CoverPage",
                "shortName":  "Cover Page",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "dei:DocumentType",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R10":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2104100 - Disclosure - Accounts Receivable, Net",
                "role":  "http://www.alarm.com/role/AccountsReceivableNet",
                "shortName":  "Accounts Receivable, Net",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R11":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:InventoryDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2105100 - Disclosure - Inventory, Net",
                "role":  "http://www.alarm.com/role/InventoryNet",
                "shortName":  "Inventory, Net",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:InventoryDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R12":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:BusinessCombinationDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2106100 - Disclosure - Acquisitions",
                "role":  "http://www.alarm.com/role/Acquisitions",
                "shortName":  "Acquisitions",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:BusinessCombinationDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R13":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2107100 - Disclosure - Goodwill and Intangible Assets, Net",
                "role":  "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNet",
                "shortName":  "Goodwill and Intangible Assets, Net",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R14":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:OtherAssetsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2108100 - Disclosure - Other Assets",
                "role":  "http://www.alarm.com/role/OtherAssets",
                "shortName":  "Other Assets",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:OtherAssetsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R15":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:FairValueDisclosuresTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2109100 - Disclosure - Fair Value Measurements",
                "role":  "http://www.alarm.com/role/FairValueMeasurements",
                "shortName":  "Fair Value Measurements",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:FairValueDisclosuresTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R16":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:LesseeOperatingLeasesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2110100 - Disclosure - Leases",
                "role":  "http://www.alarm.com/role/Leases",
                "shortName":  "Leases",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:LesseeOperatingLeasesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R17":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2111100 - Disclosure - Liabilities",
                "role":  "http://www.alarm.com/role/Liabilities",
                "shortName":  "Liabilities",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R18":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "alrm:DebtCommitmentsandContingenciesDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2112100 - Disclosure - Debt, Commitments and Contingencies",
                "role":  "http://www.alarm.com/role/DebtCommitmentsAndContingencies",
                "shortName":  "Debt, Commitments and Contingencies",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "alrm:DebtCommitmentsandContingenciesDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R19":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2113100 - Disclosure - Stockholders' Equity",
                "role":  "http://www.alarm.com/role/StockholdersEquity",
                "shortName":  "Stockholders' Equity",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R2":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1001000 - Statement - Condensed Consolidated Statements of Operations",
                "role":  "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                "shortName":  "Condensed Consolidated Statements of Operations",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:CostOfGoodsAndServicesSold",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R20":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2114100 - Disclosure - Stock-Based Compensation",
                "role":  "http://www.alarm.com/role/StockBasedCompensation",
                "shortName":  "Stock-Based Compensation",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R21":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:EarningsPerShareTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2115100 - Disclosure - Earnings Per Share",
                "role":  "http://www.alarm.com/role/EarningsPerShare",
                "shortName":  "Earnings Per Share",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:EarningsPerShareTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R22":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ConcentrationRiskDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2116100 - Disclosure - Significant Service Providers",
                "role":  "http://www.alarm.com/role/SignificantServiceProviders",
                "shortName":  "Significant Service Providers",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ConcentrationRiskDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R23":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:IncomeTaxDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2117100 - Disclosure - Income Taxes",
                "role":  "http://www.alarm.com/role/IncomeTaxes",
                "shortName":  "Income Taxes",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:IncomeTaxDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R24":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:SegmentReportingDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2118100 - Disclosure - Segment Information",
                "role":  "http://www.alarm.com/role/SegmentInformation",
                "shortName":  "Segment Information",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:SegmentReportingDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R25":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2135100 - Disclosure - Related Party Transactions",
                "role":  "http://www.alarm.com/role/RelatedPartyTransactions",
                "shortName":  "Related Party Transactions",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R26":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:BasisOfAccountingPolicyPolicyTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2202201 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Policies)",
                "role":  "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies",
                "shortName":  "Basis of Presentation and Summary of Significant Accounting Policies (Policies)",
                "subGroupType":  "policies",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:BasisOfAccountingPolicyPolicyTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R27":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2302302 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Tables)",
                "role":  "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables",
                "shortName":  "Basis of Presentation and Summary of Significant Accounting Policies (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R28":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2303301 - Disclosure - Revenue from Contracts with Customers (Tables)",
                "role":  "http://www.alarm.com/role/RevenueFromContractsWithCustomersTables",
                "shortName":  "Revenue from Contracts with Customers (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R29":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2304301 - Disclosure - Accounts Receivable, Net (Tables)",
                "role":  "http://www.alarm.com/role/AccountsReceivableNetTables",
                "shortName":  "Accounts Receivable, Net (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R3":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CashAndCashEquivalentsAtCarryingValue",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1002000 - Statement - Condensed Consolidated Balance Sheets",
                "role":  "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets",
                "shortName":  "Condensed Consolidated Balance Sheets",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CashAndCashEquivalentsAtCarryingValue",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R30":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2305301 - Disclosure - Inventory, Net (Tables)",
                "role":  "http://www.alarm.com/role/InventoryNetTables",
                "shortName":  "Inventory, Net (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R31":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2306301 - Disclosure - Acquisitions (Tables)",
                "role":  "http://www.alarm.com/role/AcquisitionsTables",
                "shortName":  "Acquisitions (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R32":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfGoodwillTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2307301 - Disclosure - Goodwill and Intangible Assets, Net (Tables)",
                "role":  "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetTables",
                "shortName":  "Goodwill and Intangible Assets, Net (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfGoodwillTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R33":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock",
                    "reportCount":  1,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2308301 - Disclosure - Other Assets Other Assets (Tables)",
                "role":  "http://www.alarm.com/role/OtherAssetsOtherAssetsTables",
                "shortName":  "Other Assets Other Assets (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "lang":  "en-US",
                    "name":  "us-gaap:FinancingReceivableCreditQualityIndicatorsTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R34":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2309301 - Disclosure - Fair Value Measurements (Tables)",
                "role":  "http://www.alarm.com/role/FairValueMeasurementsTables",
                "shortName":  "Fair Value Measurements (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R35":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "alrm:LesseeOperatingLeasesSupplementalInformationTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2310301 - Disclosure - Leases (Tables)",
                "role":  "http://www.alarm.com/role/LeasesTables",
                "shortName":  "Leases (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "alrm:LesseeOperatingLeasesSupplementalInformationTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R36":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2311301 - Disclosure - Liabilities (Tables)",
                "role":  "http://www.alarm.com/role/LiabilitiesTables",
                "shortName":  "Liabilities (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R37":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2314301 - Disclosure - Stock-Based Compensation (Tables)",
                "role":  "http://www.alarm.com/role/StockBasedCompensationTables",
                "shortName":  "Stock-Based Compensation (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R38":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2315301 - Disclosure - Earnings Per Share (Tables)",
                "role":  "http://www.alarm.com/role/EarningsPerShareTables",
                "shortName":  "Earnings Per Share (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R39":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2318301 - Disclosure - Segment Information (Tables)",
                "role":  "http://www.alarm.com/role/SegmentInformationTables",
                "shortName":  "Segment Information (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R4":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AllowanceForDoubtfulAccountsReceivable",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1002001 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)",
                "role":  "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
                "shortName":  "Condensed Consolidated Balance Sheets (Parenthetical)",
                "subGroupType":  "parenthetical",
                "uniqueAnchor":  null
                },
            "R40":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "0",
                    "first":  true,
                    "lang":  null,
                    "name":  "alrm:TrustedServiceProviders",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "service_provider",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2401401 - Disclosure - Organization (Details)",
                "role":  "http://www.alarm.com/role/OrganizationDetails",
                "shortName":  "Organization (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "0",
                    "first":  true,
                    "lang":  null,
                    "name":  "alrm:TrustedServiceProviders",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "service_provider",
                    "xsiNil":  "false"
                    }
                },
            "R41":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:CreditLossFinancialInstrumentPolicyTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "alrm:AccountsAndNotesReceivableCreditLossExpenseReversal",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2402403 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Supplemental Balance Sheet Information Regarding Leases (Details)",
                "role":  "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails",
                "shortName":  "Basis of Presentation and Summary of Significant Accounting Policies - Supplemental Balance Sheet Information Regarding Leases (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:CreditLossFinancialInstrumentPolicyTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "alrm:AccountsAndNotesReceivableCreditLossExpenseReversal",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R42":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ContractWithCustomerLiability",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2403402 - Disclosure - Revenue from Contracts with Customers - Narrative (Details)",
                "role":  "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails",
                "shortName":  "Revenue from Contracts with Customers - Narrative (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "us-gaap:RevenueRecognitionPolicyTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "D2020Q1April1st2019-March31st2020_srt_ProductOrServiceAxis_alrm_HardwareandOtherRevenueMember",
                    "decimals":  "2",
                    "lang":  null,
                    "name":  "alrm:RevenueVariableConsiderationReserveForSalesReturnsPercentOfRevenue",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    }
                },
            "R43":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ContractWithCustomerAssetNet",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2403403 - Disclosure - Revenue from Contracts with Customers - Contract Asset and Liability Balances (Details)",
                "role":  "http://www.alarm.com/role/RevenueFromContractsWithCustomersContractAssetAndLiabilityBalancesDetails",
                "shortName":  "Revenue from Contracts with Customers - Contract Asset and Liability Balances (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ContractWithCustomerAssetNet",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R44":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AccountsReceivableGrossCurrent",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2404402 - Disclosure - Accounts Receivable, Net - Schedule of Components of Accounts Receivable (Details)",
                "role":  "http://www.alarm.com/role/AccountsReceivableNetScheduleOfComponentsOfAccountsReceivableDetails",
                "shortName":  "Accounts Receivable, Net - Schedule of Components of Accounts Receivable (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AccountsReceivableGrossCurrent",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R45":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ProvisionForDoubtfulAccounts",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2404403 - Disclosure - Accounts Receivable, Net - Narrative (Details)",
                "role":  "http://www.alarm.com/role/AccountsReceivableNetNarrativeDetails",
                "shortName":  "Accounts Receivable, Net - Narrative (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1QTD_us-gaap_IncomeStatementLocationAxis_alrm_HardwareandOtherRevenueMember",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "alrm:ContractWithCustomerProvisionForProductReturns",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R46":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AllowanceForDoubtfulAccountsReceivable",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2404404 - Disclosure - Accounts Receivable, Net - Schedule of Credit Losses (Details)",
                "role":  "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails",
                "shortName":  "Accounts Receivable, Net - Schedule of Credit Losses (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2019Q4_srt_ConsolidatedEntitiesAxis_alrm_ParentCompanyAndCertainSubsidiariesMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:AllowanceForDoubtfulAccountsReceivable",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R47":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:InventoryRawMaterialsNetOfReserves",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2405402 - Disclosure - Inventory, Net (Details)",
                "role":  "http://www.alarm.com/role/InventoryNetDetails",
                "shortName":  "Inventory, Net (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:InventoryRawMaterialsNetOfReserves",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R48":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "alrm:BusinessCombinationConsiderationTransferredHoldbackAmount",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2406409 - Disclosure - Acquisitions - Acquisition of a Business (Details)",
                "role":  "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                "shortName":  "Acquisitions - Acquisition of a Business (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "I2019Q4Oct21",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R49":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "alrm:BusinessCombinationConsiderationTransferredHoldbackAmount",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2406410 - Disclosure - Acquisitions - OpenEye - Consideration Paid and Estimated Fair Value of Assets Acquired (Details)",
                "role":  "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                "shortName":  "Acquisitions - OpenEye - Consideration Paid and Estimated Fair Value of Assets Acquired (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "D2019Q1SD_us-gaap_BusinessAcquisitionAxis_alrm_OpenEyeMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "alrm:PaymentstoAcquireBusinessesNetOfWorkingCapitalAdjustment",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R5":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ProfitLoss",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1003000 - Statement - Condensed Consolidated Statements of Cash Flows",
                "role":  "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows",
                "shortName":  "Condensed Consolidated Statements of Cash Flows",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:AmortizationOfFinancingCosts",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R50":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ResearchAndDevelopmentInProcess",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2406411 - Disclosure - Acquisitions - Asset Acquisition (Details)",
                "role":  "http://www.alarm.com/role/AcquisitionsAssetAcquisitionDetails",
                "shortName":  "Acquisitions - Asset Acquisition (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "D2020Q1March31st_alrm_AssetAcquisitionAxis_alrm_IPRDMember",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "us-gaap:ResearchAndDevelopmentInProcess",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R51":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:Goodwill",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2407402 - Disclosure - Goodwill and Intangible Assets, Net - Schedule of Goodwill (Details)",
                "role":  "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfGoodwillDetails",
                "shortName":  "Goodwill and Intangible Assets, Net - Schedule of Goodwill (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfGoodwillTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2019Q4_us-gaap_StatementBusinessSegmentsAxis_alrm_Alarm.ComMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:Goodwill",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R52":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:GoodwillImpairmentLoss",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2407403 - Disclosure - Goodwill and Intangible Assets, Net - Narrative (Details)",
                "role":  "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetNarrativeDetails",
                "shortName":  "Goodwill and Intangible Assets, Net - Narrative (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:GoodwillImpairmentLoss",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R53":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:FiniteLivedIntangibleAssetsNet",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2407404 - Disclosure - Goodwill and Intangible Assets, Net - Schedule of Net Carrying Amount of Intangible Assets (Details)",
                "role":  "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfNetCarryingAmountOfIntangibleAssetsDetails",
                "shortName":  "Goodwill and Intangible Assets, Net - Schedule of Net Carrying Amount of Intangible Assets (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_us-gaap_CustomerRelationshipsMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:AmortizationOfIntangibleAssets",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R54":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:FiniteLivedIntangibleAssetsGross",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2407405 - Disclosure - Goodwill and Intangible Assets, Net - Schedule of Weighted Average Remaining Life and Carrying Value of Finite-Lived Intangible Assets (Details)",
                "role":  "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails",
                "shortName":  "Goodwill and Intangible Assets, Net - Schedule of Weighted Average Remaining Life and Carrying Value of Finite-Lived Intangible Assets (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R55":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:FiniteLivedIntangibleAssetsNet",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2408402 - Disclosure - Other Assets - Patent Licenses (Details)",
                "role":  "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails",
                "shortName":  "Other Assets - Patent Licenses (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_us-gaap_PatentsMember",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "us-gaap:FiniteLivedIntangibleAssetsNet",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R56":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2408403 - Disclosure - Other Assets - Loan to a Distribution Partner and Prepaid Expenses (Details)",
                "role":  "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                "shortName":  "Other Assets - Loan to a Distribution Partner and Prepaid Expenses (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2016Q3_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_us-gaap_LoansReceivableMember_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_alrm_DistributionPartnerTwoMember",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "alrm:NotesReceivableMaximumAvailable",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R57":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:PaymentsToAcquireNotesReceivable",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2408404 - Disclosure - Other Assets - Loan to a Hardware Supplier (Details)",
                "role":  "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails",
                "shortName":  "Other Assets - Loan to a Hardware Supplier (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "D2019Q1Mar01-Mar30_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_us-gaap_NotesReceivableMember",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "us-gaap:PaymentsToAcquireNotesReceivable",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R58":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ProvisionForLoanLossesExpensed",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2408405 - Disclosure - Other Assets - Schedule of Notes Receivable Credit Losses (Details)",
                "role":  "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails",
                "shortName":  "Other Assets - Schedule of Notes Receivable Credit Losses (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2019Q4_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_us-gaap_LoansReceivableMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:FinancingReceivableAllowanceForCreditLosses",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R59":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:FinancingReceivableCreditQualityIndicatorsTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_us-gaap_LoansReceivableMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:FinancingReceivableOriginatedInCurrentFiscalYear",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2408406 - Disclosure - Other Assets - Credit Qualtiy Indicators (Details)",
                "role":  "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails",
                "shortName":  "Other Assets - Credit Qualtiy Indicators (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:FinancingReceivableCreditQualityIndicatorsTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_us-gaap_LoansReceivableMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:FinancingReceivableOriginatedInCurrentFiscalYear",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R6":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2018Q4_us-gaap_StatementEquityComponentsAxis_us-gaap_PreferredStockMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:SharesOutstanding",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1004000 - Statement - Condensed Consolidated Statements of Equity",
                "role":  "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity",
                "shortName":  "Condensed Consolidated Statements of Equity",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2018Q4_us-gaap_StatementEquityComponentsAxis_us-gaap_PreferredStockMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:SharesOutstanding",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    }
                },
            "R60":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfFinancingReceivablesNonAccrualStatusTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "alrm:FinancingReceivableAmortizedCostNonaccrual",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2408407 - Disclosure - Other Assets - Amortized Cost (Details)",
                "role":  "http://www.alarm.com/role/OtherAssetsAmortizedCostDetails",
                "shortName":  "Other Assets - Amortized Cost (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfFinancingReceivablesNonAccrualStatusTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "alrm:FinancingReceivableAmortizedCostNonaccrual",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R61":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:FinancingReceivableNonaccrualInterestIncome",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2408408 - Disclosure - Other Assets - Allowance For Credit Losses Narrative (Details)",
                "role":  "http://www.alarm.com/role/OtherAssetsAllowanceForCreditLossesNarrativeDetails",
                "shortName":  "Other Assets - Allowance For Credit Losses Narrative (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:FinancingReceivableNonaccrualInterestIncome",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R62":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:BusinessCombinationContingentConsiderationLiability",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2409402 - Disclosure - Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)",
                "role":  "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails",
                "shortName":  "Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:AssetsFairValueDisclosure",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R63":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2019Q4_us-gaap_FairValueByLiabilityClassAxis_alrm_ContingentConsiderationLiabilityFromAcquisitionsMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2409403 - Disclosure - Fair Value Measurements - Summary of Fair Value of Level 3 Subsidiary Unit Awards and Contingent Consideration (Details)",
                "role":  "http://www.alarm.com/role/FairValueMeasurementsSummaryOfFairValueOfLevel3SubsidiaryUnitAwardsAndContingentConsiderationDetails",
                "shortName":  "Fair Value Measurements - Summary of Fair Value of Level 3 Subsidiary Unit Awards and Contingent Consideration (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2019Q4_us-gaap_FairValueByLiabilityClassAxis_alrm_ContingentConsiderationLiabilityFromAcquisitionsMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R64":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:BusinessCombinationContingentConsiderationLiability",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2409404 - Disclosure - Fair Value Measurements - Narrative (Details)",
                "role":  "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails",
                "shortName":  "Fair Value Measurements - Narrative (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "INF",
                    "lang":  null,
                    "name":  "us-gaap:ImpairmentOfInvestments",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R65":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "alrm:OperatingLeaseAvailableLeaseholdImprovementAllowance",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2410402 - Disclosure - Leases - Narrative (Details)",
                "role":  "http://www.alarm.com/role/LeasesNarrativeDetails",
                "shortName":  "Leases - Narrative (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "alrm:OperatingLeaseAvailableLeaseholdImprovementAllowance",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R66":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "alrm:LesseeOperatingLeasesSupplementalInformationTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeaseCost",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2410403 - Disclosure - Leases Leases - Supplemental Information Related to Leases (Details)",
                "role":  "http://www.alarm.com/role/LeasesLeasesSupplementalInformationRelatedToLeasesDetails",
                "shortName":  "Leases Leases - Supplemental Information Related to Leases (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "alrm:LesseeOperatingLeasesSupplementalInformationTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeaseCost",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R67":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2410404 - Disclosure - Leases Leases - Maturities of Lease Liabilities (Details)",
                "role":  "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails",
                "shortName":  "Leases Leases - Maturities of Lease Liabilities (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R68":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AccountsPayableCurrent",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2411402 - Disclosure - Liabilities - Components of Accounts Payable, Accrued Expenses, and Other Current Liabilities (Details)",
                "role":  "http://www.alarm.com/role/LiabilitiesComponentsOfAccountsPayableAccruedExpensesAndOtherCurrentLiabilitiesDetails",
                "shortName":  "Liabilities - Components of Accounts Payable, Accrued Expenses, and Other Current Liabilities (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AccountsPayableCurrent",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R69":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:BusinessCombinationContingentConsiderationLiability",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2411403 - Disclosure - Liabilities - Other Liabilities (Details)",
                "role":  "http://www.alarm.com/role/LiabilitiesOtherLiabilitiesDetails",
                "shortName":  "Liabilities - Other Liabilities (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:OtherAccruedLiabilitiesNoncurrent",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R7":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:NatureOfOperations",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2101100 - Disclosure - Organization",
                "role":  "http://www.alarm.com/role/Organization",
                "shortName":  "Organization",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:NatureOfOperations",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R70":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ProceedsFromLinesOfCredit",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2412401 - Disclosure - Debt, Commitments and Contingencies - Debt (Details)",
                "role":  "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                "shortName":  "Debt, Commitments and Contingencies - Debt (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD_us-gaap_CreditFacilityAxis_us-gaap_RevolvingCreditFacilityMember_us-gaap_DebtInstrumentAxis_alrm_TwoThousandSeventeenFacilityMember",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "us-gaap:ProceedsFromLinesOfCredit",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R71":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1_us-gaap_CreditFacilityAxis_us-gaap_LetterOfCreditMember_us-gaap_DebtInstrumentAxis_alrm_TwoThousandSeventeenFacilityMember_us-gaap_LongtermDebtTypeAxis_us-gaap_LineOfCreditMember",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LettersOfCreditOutstandingAmount",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2412402 - Disclosure - Debt, Commitments and Contingencies - Letters of Credit (Details)",
                "role":  "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails",
                "shortName":  "Debt, Commitments and Contingencies - Letters of Credit (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1_us-gaap_CreditFacilityAxis_us-gaap_LetterOfCreditMember_us-gaap_DebtInstrumentAxis_alrm_TwoThousandSeventeenFacilityMember_us-gaap_LongtermDebtTypeAxis_us-gaap_LineOfCreditMember",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LettersOfCreditOutstandingAmount",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R72":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "D2020Q1Jan312020_srt_LitigationCaseAxis_alrm_EcoFactorInc.vs.Alarm.comHoldingsInc.Member_us-gaap_LitigationStatusAxis_us-gaap_PendingLitigationMember",
                    "decimals":  "0",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LossContingencyPatentsAllegedlyInfringedNumber",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "patent",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2412403 - Disclosure - Debt, Commitments and Contingencies - Legal Proceedings (Details)",
                "role":  "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails",
                "shortName":  "Debt, Commitments and Contingencies - Legal Proceedings (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "D2020Q1Jan312020_srt_LitigationCaseAxis_alrm_EcoFactorInc.vs.Alarm.comHoldingsInc.Member_us-gaap_LitigationStatusAxis_us-gaap_PendingLitigationMember",
                    "decimals":  "0",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LossContingencyPatentsAllegedlyInfringedNumber",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "patent",
                    "xsiNil":  "false"
                    }
                },
            "R73":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "I2018Q4nov29",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2413401 - Disclosure - Stockholders' Equity (Details)",
                "role":  "http://www.alarm.com/role/StockholdersEquityDetails",
                "shortName":  "Stockholders' Equity (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "I2018Q4nov29",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R74":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AllocatedShareBasedCompensationExpense",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2414402 - Disclosure - Stock-Based Compensation - Stock-Based Compensation Expense (Details)",
                "role":  "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails",
                "shortName":  "Stock-Based Compensation - Stock-Based Compensation Expense (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AllocatedShareBasedCompensationExpense",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R75":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1QTD_us-gaap_AwardTypeAxis_us-gaap_EmployeeStockOptionMember",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2414403 - Disclosure - Stock-Based Compensation - Narrative (Details)",
                "role":  "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails",
                "shortName":  "Stock-Based Compensation - Narrative (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1QTD_us-gaap_AwardTypeAxis_us-gaap_EmployeeStockOptionMember",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    }
                },
            "R76":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ProfitLoss",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2415402 - Disclosure - Earnings Per Share - Components of Basic and Diluted EPS (Details)",
                "role":  "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails",
                "shortName":  "Earnings Per Share - Components of Basic and Diluted EPS (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "0",
                    "lang":  null,
                    "name":  "us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    }
                },
            "R77":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1QTD_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_us-gaap_EmployeeStockOptionMember",
                    "decimals":  "0",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2415403 - Disclosure - Earnings Per Share - Schedule of Securities Excluded from Calculation of Diluted Weighted Average Common Shares Outstanding Due to Anti-dilutive Effect (Details)",
                "role":  "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails",
                "shortName":  "Earnings Per Share - Schedule of Securities Excluded from Calculation of Diluted Weighted Average Common Shares Outstanding Due to Anti-dilutive Effect (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1QTD_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_us-gaap_EmployeeStockOptionMember",
                    "decimals":  "0",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    }
                },
            "R78":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1QTD_srt_MajorCustomersAxis_alrm_TenLargestServiceProvidersMember_us-gaap_ConcentrationRiskByBenchmarkAxis_us-gaap_SalesRevenueNetMember_us-gaap_ConcentrationRiskByTypeAxis_us-gaap_CustomerConcentrationRiskMember",
                    "decimals":  "2",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ConcentrationRiskPercentage1",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2416401 - Disclosure - Significant Service Providers (Details)",
                "role":  "http://www.alarm.com/role/SignificantServiceProvidersDetails",
                "shortName":  "Significant Service Providers (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1QTD_srt_MajorCustomersAxis_alrm_TenLargestServiceProvidersMember_us-gaap_ConcentrationRiskByBenchmarkAxis_us-gaap_SalesRevenueNetMember_us-gaap_ConcentrationRiskByTypeAxis_us-gaap_CustomerConcentrationRiskMember",
                    "decimals":  "2",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ConcentrationRiskPercentage1",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    }
                },
            "R79":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:IncomeTaxExpenseBenefit",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2417401 - Disclosure - Income Taxes (Details)",
                "role":  "http://www.alarm.com/role/IncomeTaxesDetails",
                "shortName":  "Income Taxes (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "3",
                    "lang":  null,
                    "name":  "us-gaap:EffectiveIncomeTaxRateContinuingOperations",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    }
                },
            "R8":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2102100 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies",
                "role":  "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPolicies",
                "shortName":  "Basis of Presentation and Summary of Significant Accounting Policies",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R80":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2418402 - Disclosure - Segment Information (Details)",
                "role":  "http://www.alarm.com/role/SegmentInformationDetails",
                "shortName":  "Segment Information (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  "INF",
                    "lang":  null,
                    "name":  "us-gaap:NumberOfReportableSegments",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "segment",
                    "xsiNil":  "false"
                    }
                },
            "R81":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2435401 - Disclosure - Related Party Transactions (Details)",
                "role":  "http://www.alarm.com/role/RelatedPartyTransactionsDetails",
                "shortName":  "Related Party Transactions (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FI2020Q1_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_alrm_InstallationPartnerMember",
                    "decimals":  "3",
                    "lang":  null,
                    "name":  "us-gaap:EquityMethodInvestmentOwnershipPercentage",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    }
                },
            "R9":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:RevenueFromContractWithCustomerTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2103100 - Disclosure - Revenue from Contracts with Customers",
                "role":  "http://www.alarm.com/role/RevenueFromContractsWithCustomers",
                "shortName":  "Revenue from Contracts with Customers",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "FD2020Q1YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:RevenueFromContractWithCustomerTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R9999":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "alarmcom10-qmarch312020.htm",
                    "contextRef":  "I2019Q1Jan01",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "",
                "isDefault":  "false",
                "longName":  "Uncategorized Items - alarmcom10-qmarch312020.htm",
                "role":  "http://xbrl.sec.gov/role/uncategorizedFacts",
                "shortName":  "Uncategorized Items - alarmcom10-qmarch312020.htm",
                "subGroupType":  "",
                "uniqueAnchor":  null
                }
            },
        "segmentCount":  94,
        "tag":  {
            "alrm_AccountsAndNotesReceivableCreditLossExpenseReversal":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accounts And Notes Receivable, Credit Loss Expense (Reversal)",
                            "label":  "Accounts And Notes Receivable, Credit Loss Expense (Reversal)",
                            "terseLabel":  "Credit loss expense (reversal) for accounts and notes receivable"
                            }
                        }
                    },
                "localname":  "AccountsAndNotesReceivableCreditLossExpenseReversal",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_AccountsPayableAccruedLiabilitiesandOtherCurrentLiabilitiesCurrent":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LiabilitiesCurrent",
                        "weight":  1.0
                        },
                    "http://www.alarm.com/role/LiabilitiesComponentsOfAccountsPayableAccruedExpensesAndOtherCurrentLiabilitiesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accounts Payable, Accrued Liabilities and Other Current Liabilities, Current",
                            "label":  "Accounts Payable, Accrued Liabilities and Other Current Liabilities, Current",
                            "terseLabel":  "Accounts payable, accrued expenses and other current liabilities",
                            "totalLabel":  "Accounts payable, accrued expenses and other current liabilities"
                            }
                        }
                    },
                "localname":  "AccountsPayableAccruedLiabilitiesandOtherCurrentLiabilitiesCurrent",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets",
                    "http://www.alarm.com/role/LiabilitiesComponentsOfAccountsPayableAccruedExpensesAndOtherCurrentLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_AccruedContingentLiabilityNotesReceivable":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accrued Contingent Liability, Notes Receivable",
                            "label":  "Accrued Contingent Liability, Notes Receivable",
                            "terseLabel":  "Accrued contingent liability"
                            }
                        }
                    },
                "localname":  "AccruedContingentLiabilityNotesReceivable",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_ActivationFeesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Activation Fees [Member]",
                            "label":  "Activation Fees [Member]",
                            "terseLabel":  "Activation Fees"
                            }
                        }
                    },
                "localname":  "ActivationFeesMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_Alarm.ComMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Alarm.Com [Member]",
                            "label":  "Alarm.Com [Member]",
                            "terseLabel":  "Alarm.com"
                            }
                        }
                    },
                "localname":  "Alarm.ComMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetNarrativeDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfGoodwillDetails",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_AllowanceforProductReturnsCurrent":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfComponentsOfAccountsReceivableDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_AccountsReceivableNetCurrent",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Allowance for Product Returns, Current",
                            "label":  "Allowance for Product Returns, Current",
                            "negatedLabel":  "Allowance for product returns",
                            "negatedTerseLabel":  "Allowance for product returns"
                            }
                        }
                    },
                "localname":  "AllowanceforProductReturnsCurrent",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfComponentsOfAccountsReceivableDetails",
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_AssetAcquisitionAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Asset Acquisition [Axis]",
                            "label":  "Asset Acquisition [Axis]",
                            "terseLabel":  "Asset Acquisition [Axis]"
                            }
                        }
                    },
                "localname":  "AssetAcquisitionAxis",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAssetAcquisitionDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "alrm_AssetAcquisitionConsiderationTransferredFuturePaymentTimePeriod":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Asset Acquisition, Consideration Transferred, Future Payment Time Period",
                            "label":  "Asset Acquisition, Consideration Transferred, Future Payment Time Period",
                            "terseLabel":  "Expected repayment time period"
                            }
                        }
                    },
                "localname":  "AssetAcquisitionConsiderationTransferredFuturePaymentTimePeriod",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAssetAcquisitionDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "alrm_AssetAcquisitionDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "[Domain] for Asset Acquisition [Axis]",
                            "label":  "Asset Acquisition [Domain]",
                            "terseLabel":  "Asset Acquisition [Domain]"
                            }
                        }
                    },
                "localname":  "AssetAcquisitionDomain",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAssetAcquisitionDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_BusinessCombinationConsiderationTransferredAdjustments":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Business Combination, Consideration Transferred, Adjustments",
                            "label":  "Business Combination, Consideration Transferred, Adjustments",
                            "terseLabel":  "Contingent consideration"
                            }
                        }
                    },
                "localname":  "BusinessCombinationConsiderationTransferredAdjustments",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_BusinessCombinationConsiderationTransferredHoldbackAmount":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LiabilitiesOtherLiabilitiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_OtherLiabilitiesNoncurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Business Combination, Consideration Transferred, Holdback Amount",
                            "label":  "Business Combination, Consideration Transferred, Holdback Amount",
                            "terseLabel":  "Holdback consideration",
                            "verboseLabel":  "Holdback liability from acquisitions"
                            }
                        }
                    },
                "localname":  "BusinessCombinationConsiderationTransferredHoldbackAmount",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                    "http://www.alarm.com/role/LiabilitiesOtherLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesAccruedCompensation":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  8.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Compensation",
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Compensation",
                            "negatedLabel":  "Accrued expenses"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesAccruedCompensation",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_ChangeInContractWithCustomerAssetRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Change In Contract With Customer, Asset [Roll Forward]",
                            "label":  "Change In Contract With Customer, Asset [Roll Forward]",
                            "terseLabel":  "Change in Contract Asset Balance"
                            }
                        }
                    },
                "localname":  "ChangeInContractWithCustomerAssetRollForward",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersContractAssetAndLiabilityBalancesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "alrm_ChangeInContractWithCustomerLiabilityRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Change In Contract With Customer, Liability [Roll Forward]",
                            "label":  "Change In Contract With Customer, Liability [Roll Forward]",
                            "verboseLabel":  "Change In Contract With Customer, Liability [Roll Forward]"
                            }
                        }
                    },
                "localname":  "ChangeInContractWithCustomerLiabilityRollForward",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersContractAssetAndLiabilityBalancesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "alrm_CommissionMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Commission [Member]",
                            "label":  "Commission [Member]",
                            "terseLabel":  "Commissions and upfront payments made to a customer"
                            }
                        }
                    },
                "localname":  "CommissionMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_CommonStockSubjecttoRepurchaseMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Common Stock Subject to Repurchase [Member]",
                            "label":  "Common Stock Subject to Repurchase [Member]",
                            "terseLabel":  "Common stock subject to repurchase"
                            }
                        }
                    },
                "localname":  "CommonStockSubjecttoRepurchaseMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_ConsolidatedLeverageRatioGreaterThanOrEqualTo1.00ButLessThan2.00Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Consolidated Leverage Ratio, Greater Than Or Equal To 1.00 But Less Than 2.00 [Member]",
                            "label":  "Consolidated Leverage Ratio, Greater Than Or Equal To 1.00 But Less Than 2.00 [Member]",
                            "terseLabel":  "Greater than or equal to 1.00 but less than 2.00"
                            }
                        }
                    },
                "localname":  "ConsolidatedLeverageRatioGreaterThanOrEqualTo1.00ButLessThan2.00Member",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_ConsolidatedLeverageRatioGreaterThanOrEqualTo2.00ButLessThan3.00Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Consolidated Leverage Ratio, Greater Than Or Equal To 2.00 But Less Than 3.00 [Member]",
                            "label":  "Consolidated Leverage Ratio, Greater Than Or Equal To 2.00 But Less Than 3.00 [Member]",
                            "terseLabel":  "Greater Than Or Equal To 2.00 But Less Than 3.00"
                            }
                        }
                    },
                "localname":  "ConsolidatedLeverageRatioGreaterThanOrEqualTo2.00ButLessThan3.00Member",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_ConsolidatedLeverageRatioGreaterThanOrEqualTo3.00Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Consolidated Leverage Ratio, Greater Than Or Equal To 3.00 [Member]",
                            "label":  "Consolidated Leverage Ratio, Greater Than Or Equal To 3.00 [Member]",
                            "terseLabel":  "Greater Than Or Equal To 3.00"
                            }
                        }
                    },
                "localname":  "ConsolidatedLeverageRatioGreaterThanOrEqualTo3.00Member",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_ConsolidatedLeverageRatioLessThan1.00Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Consolidated Leverage Ratio, Less Than 1.00 [Member]",
                            "label":  "Consolidated Leverage Ratio, Less Than 1.00 [Member]",
                            "terseLabel":  "Less than 1.00"
                            }
                        }
                    },
                "localname":  "ConsolidatedLeverageRatioLessThan1.00Member",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_ContingentConsiderationLiabilityFromAcquisitionsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Contingent Consideration Liability From Acquisitions [Member]",
                            "label":  "Contingent Consideration Liability From Acquisitions [Member]",
                            "terseLabel":  "Contingent Consideration Liability From Acquisitions"
                            }
                        }
                    },
                "localname":  "ContingentConsiderationLiabilityFromAcquisitionsMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsSummaryOfFairValueOfLevel3SubsidiaryUnitAwardsAndContingentConsiderationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_ContractWithCustomerAssetCommissionCostsandUpfrontPaymentsToACustomerCapitalizedDuringPeriod":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Contract With Customer, Asset, Commission Costs and Upfront Payments To A Customer Capitalized During Period",
                            "label":  "Contract With Customer, Asset, Commission Costs and Upfront Payments To A Customer Capitalized During Period",
                            "terseLabel":  "Commission costs and upfront payments to a customer capitalized in period"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerAssetCommissionCostsandUpfrontPaymentsToACustomerCapitalizedDuringPeriod",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersContractAssetAndLiabilityBalancesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_ContractWithCustomerLiabilityRevenueDeferredDuringPeriod":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Contract With Customer, Liability, Revenue Deferred During Period",
                            "label":  "Contract With Customer, Liability, Revenue Deferred During Period",
                            "terseLabel":  "Revenue deferred in period"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerLiabilityRevenueDeferredDuringPeriod",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersContractAssetAndLiabilityBalancesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_ContractWithCustomerProvisionForProductReturns":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Contract With Customer, Provision For Product Returns",
                            "label":  "Contract With Customer, Provision For Product Returns",
                            "terseLabel":  "Reserve for product returns",
                            "verboseLabel":  "Reserve (reduction to reserve) for product returns"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerProvisionForProductReturns",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetNarrativeDetails",
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_CostofHardwareandOtherRevenueMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Cost of Hardware and Other Revenue [Member]",
                            "label":  "Cost of Hardware and Other Revenue [Member]",
                            "terseLabel":  "Cost of Hardware and Other Revenue"
                            }
                        }
                    },
                "localname":  "CostofHardwareandOtherRevenueMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_CostofSaaSandLicenseRevenueMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Cost of SaaS and License Revenue [Member]",
                            "label":  "Cost of SaaS and License Revenue [Member]",
                            "terseLabel":  "Cost of SaaS and License Revenue"
                            }
                        }
                    },
                "localname":  "CostofSaaSandLicenseRevenueMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_CumulativeEffectPeriodOfAdoptionAdjustmentMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Cumulative Effect, Period Of Adoption, Adjustment [Member]",
                            "label":  "Cumulative Effect, Period Of Adoption, Adjustment [Member]",
                            "terseLabel":  "Impact of adopting Topic 326",
                            "verboseLabel":  "Impact of adopting Topic 326"
                            }
                        }
                    },
                "localname":  "CumulativeEffectPeriodOfAdoptionAdjustmentMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails",
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails",
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_CumulativeEffectPeriodOfAdoptionAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Cumulative Effect, Period Of Adoption [Axis]",
                            "label":  "Cumulative Effect, Period Of Adoption [Axis]",
                            "terseLabel":  "Cumulative Effect, Period Of Adoption [Axis]"
                            }
                        }
                    },
                "localname":  "CumulativeEffectPeriodOfAdoptionAxis",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails",
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails",
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "alrm_CumulativeEffectPeriodOfAdoptionDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "[Domain] for Cumulative Effect, Period Of Adoption [Axis]",
                            "label":  "Cumulative Effect, Period Of Adoption [Domain]",
                            "terseLabel":  "Cumulative Effect, Period Of Adoption [Domain]"
                            }
                        }
                    },
                "localname":  "CumulativeEffectPeriodOfAdoptionDomain",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails",
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails",
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_DebtCommitmentsandContingenciesDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt, Commitments and Contingencies Disclosure [Abstract]",
                            "label":  "Debt, Commitments and Contingencies Disclosure [Abstract]"
                            }
                        }
                    },
                "localname":  "DebtCommitmentsandContingenciesDisclosureAbstract",
                "nsuri":  "http://www.alarm.com/20200331",
                "xbrltype":  "stringItemType"
                },
            "alrm_DebtCommitmentsandContingenciesDisclosureTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt, Commitments and Contingencies Disclosure [Text Block]",
                            "label":  "Debt, Commitments and Contingencies Disclosure [Text Block]",
                            "terseLabel":  "Debt, Commitments and Contingencies"
                            }
                        }
                    },
                "localname":  "DebtCommitmentsandContingenciesDisclosureTextBlock",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingencies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "alrm_DebtCovenantTermsAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt Covenant Terms [Axis]",
                            "label":  "Debt Covenant Terms [Axis]",
                            "terseLabel":  "Debt Covenant Terms [Axis]"
                            }
                        }
                    },
                "localname":  "DebtCovenantTermsAxis",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "alrm_DebtCovenantTermsDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "[Domain] for Debt Covenant Terms [Axis]",
                            "label":  "Debt Covenant Terms [Domain]",
                            "terseLabel":  "Debt Covenant Terms [Domain]"
                            }
                        }
                    },
                "localname":  "DebtCovenantTermsDomain",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_DebtInstrumentInterestRateTermsLeverageRatio":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt Instrument, Interest Rate Terms, Leverage Ratio",
                            "label":  "Debt Instrument, Interest Rate Terms, Leverage Ratio",
                            "terseLabel":  "Interest rate terms, leverage ratio"
                            }
                        }
                    },
                "localname":  "DebtInstrumentInterestRateTermsLeverageRatio",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "pureItemType"
                },
            "alrm_DepreciationDepletionandAmortizationNonproductionMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Depreciation, Depletion and Amortization, Nonproduction [Member]",
                            "label":  "Depreciation, Depletion and Amortization, Nonproduction [Member]",
                            "terseLabel":  "Amortization and depreciation expense"
                            }
                        }
                    },
                "localname":  "DepreciationDepletionandAmortizationNonproductionMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_DistributionPartnerThreeMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Distribution Partner Three [Member]",
                            "label":  "Distribution Partner Three [Member]",
                            "terseLabel":  "Distribution Partner Three"
                            }
                        }
                    },
                "localname":  "DistributionPartnerThreeMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_DistributionPartnerTwoMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Distribution Partner Two [Member]",
                            "label":  "Distribution Partner Two [Member]",
                            "terseLabel":  "Distribution Partner Two"
                            }
                        }
                    },
                "localname":  "DistributionPartnerTwoMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_DistributionPartnersTwoAndThreeMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Distribution Partners Two And Three [Member]",
                            "label":  "Distribution Partners Two And Three [Member]",
                            "terseLabel":  "Distribution Partners Two and Three"
                            }
                        }
                    },
                "localname":  "DistributionPartnersTwoAndThreeMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_EcoFactorInc.vs.Alarm.comHoldingsInc.Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "EcoFactor, Inc. vs.  Alarm.com Holdings, Inc. [Member]",
                            "label":  "EcoFactor, Inc. vs.  Alarm.com Holdings, Inc. [Member]",
                            "terseLabel":  "EcoFactor, Inc. vs.  Alarm.com Holdings, Inc."
                            }
                        }
                    },
                "localname":  "EcoFactorInc.vs.Alarm.comHoldingsInc.Member",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_EmployeeStockPurchasePlanMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Employee Stock Purchase Plan [Member]",
                            "label":  "Employee Stock Purchase Plan [Member]",
                            "terseLabel":  "Employee stock purchase plan"
                            }
                        }
                    },
                "localname":  "EmployeeStockPurchasePlanMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_FinancialAsset90To119DaysPastDueMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Financial Asset, 90 To 119 Days Past Due [Member]",
                            "label":  "Financial Asset, 90 To 119 Days Past Due [Member]",
                            "terseLabel":  "90-119 days past due"
                            }
                        }
                    },
                "localname":  "FinancialAsset90To119DaysPastDueMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_FinancialAssetEqualtoorGreaterthan120DaysPastDueMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Financial Asset, Equal to or Greater than 120 Days Past Due [Member]",
                            "label":  "Financial Asset, Equal to or Greater than 120 Days Past Due [Member]",
                            "terseLabel":  "120 days past due"
                            }
                        }
                    },
                "localname":  "FinancialAssetEqualtoorGreaterthan120DaysPastDueMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_FinancingReceivableAmortizedCostNonaccrual":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Financing Receivable, Amortized Cost, Nonaccrual",
                            "label":  "Financing Receivable, Amortized Cost, Nonaccrual",
                            "terseLabel":  "Amortized cost of nonaccrual notes receivable"
                            }
                        }
                    },
                "localname":  "FinancingReceivableAmortizedCostNonaccrual",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAmortizedCostDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_FiveYearRenewalOptionMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Five Year Renewal Option [Member]",
                            "label":  "Five Year Renewal Option [Member]",
                            "terseLabel":  "Five Year Renewal Option"
                            }
                        }
                    },
                "localname":  "FiveYearRenewalOptionMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_FuturePaymentsforAssetAcquisition":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Future Payments for Asset Acquisition",
                            "label":  "Future Payments for Asset Acquisition",
                            "terseLabel":  "Future payments for asset acquisition"
                            }
                        }
                    },
                "localname":  "FuturePaymentsforAssetAcquisition",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAssetAcquisitionDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_HardwareSupplierMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Hardware Supplier [Member]",
                            "label":  "Hardware Supplier [Member]",
                            "terseLabel":  "Hardware Supplier"
                            }
                        }
                    },
                "localname":  "HardwareSupplierMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_HardwareandOtherRevenueMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Hardware and Other Revenue [Member]",
                            "label":  "Hardware and Other Revenue [Member]",
                            "terseLabel":  "Hardware and other",
                            "verboseLabel":  "Hardware and other revenue"
                            }
                        }
                    },
                "localname":  "HardwareandOtherRevenueMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetNarrativeDetails",
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_IPRDMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "IPR&D [Member]",
                            "label":  "IPR&D [Member]",
                            "terseLabel":  "IPR&D"
                            }
                        }
                    },
                "localname":  "IPRDMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAssetAcquisitionDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_IncreaseDecreaseInOperatingLeaseLiabilities":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  17.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Increase (Decrease) In Operating Lease Liabilities",
                            "label":  "Increase (Decrease) In Operating Lease Liabilities",
                            "terseLabel":  "Operating lease liabilities"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInOperatingLeaseLiabilities",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_IncreaseDecreaseinAccountsPayableAccruedLiabilitiesandOtherCurrentLiabilities":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  15.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Increase (Decrease) in Accounts Payable, Accrued Liabilities and Other Current Liabilities",
                            "label":  "Increase (Decrease) in Accounts Payable, Accrued Liabilities and Other Current Liabilities",
                            "terseLabel":  "Accounts payable, accrued expenses and other current liabilities"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseinAccountsPayableAccruedLiabilitiesandOtherCurrentLiabilities",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_InstallationPartnerMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Installation Partner [Member]",
                            "label":  "Installation Partner [Member]",
                            "terseLabel":  "Installation Partner"
                            }
                        }
                    },
                "localname":  "InstallationPartnerMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_LeaseTypeAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Lease Type [Axis]",
                            "label":  "Lease Type [Axis]",
                            "terseLabel":  "Lease Type [Axis]"
                            }
                        }
                    },
                "localname":  "LeaseTypeAxis",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "alrm_LeaseTypeDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "[Domain] for Lease Type [Axis]",
                            "label":  "Lease Type [Domain]",
                            "terseLabel":  "Lease Type [Domain]"
                            }
                        }
                    },
                "localname":  "LeaseTypeDomain",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_LesseeOperatingLeaseLeaseNotYetCommencedMinimumLeasePayments":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Lessee, Operating Lease, Lease Not Yet Commenced, Minimum Lease Payments",
                            "label":  "Lessee, Operating Lease, Lease Not Yet Commenced, Minimum Lease Payments",
                            "terseLabel":  "Legally binding minimum lease payments on leases not yet commenced"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLeaseNotYetCommencedMinimumLeasePayments",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_LesseeOperatingLeaseOptionToExtendAmount":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Lessee, Operating Lease, Option To Extend, Amount",
                            "label":  "Lessee, Operating Lease, Option To Extend, Amount",
                            "terseLabel":  "Amount for options to extend lease"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseOptionToExtendAmount",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_LesseeOperatingLeasesSupplementalInformationTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Lessee, Operating Leases, Supplemental Information [Table Text Block]",
                            "label":  "Lessee, Operating Leases, Supplemental Information [Table Text Block]",
                            "terseLabel":  "Supplemental Information Related to Leases"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeasesSupplementalInformationTableTextBlock",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "alrm_LineofCreditFacilityCovenantTermsFixedChargeCoverageRatioMinimum":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line of Credit Facility, Covenant Terms, Fixed Charge Coverage Ratio, Minimum",
                            "label":  "Line of Credit Facility, Covenant Terms, Fixed Charge Coverage Ratio, Minimum",
                            "terseLabel":  "Consolidated fixed charge coverage ratio covenant (at least)"
                            }
                        }
                    },
                "localname":  "LineofCreditFacilityCovenantTermsFixedChargeCoverageRatioMinimum",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "pureItemType"
                },
            "alrm_LineofCreditFacilityCovenantTermsLeverageRatioMaximum":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line of Credit Facility, Covenant Terms, Leverage Ratio, Maximum",
                            "label":  "Line of Credit Facility, Covenant Terms, Leverage Ratio, Maximum",
                            "terseLabel":  "Consolidated leverage ratio covenant (not to exceed)"
                            }
                        }
                    },
                "localname":  "LineofCreditFacilityCovenantTermsLeverageRatioMaximum",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "pureItemType"
                },
            "alrm_LoansReceivableAnnualPrincipalPayment":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Loans Receivable, Annual Principal Payment",
                            "label":  "Loans Receivable, Annual Principal Payment",
                            "terseLabel":  "Annual principal repayment on loan"
                            }
                        }
                    },
                "localname":  "LoansReceivableAnnualPrincipalPayment",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_LossContingencyPatentsAllegedlyInfringedNumberofPatentsAllegedlyInfringedbyElementsinSolution":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Loss Contingency, Patents Allegedly Infringed, Number of Patents Allegedly Infringed by Elements in Solution",
                            "label":  "Loss Contingency, Patents Allegedly Infringed, Number of Patents Allegedly Infringed by Elements in Solution",
                            "terseLabel":  "Number of patents allegedly infringed by elements in solution"
                            }
                        }
                    },
                "localname":  "LossContingencyPatentsAllegedlyInfringedNumberofPatentsAllegedlyInfringedbyElementsinSolution",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "alrm_LossContingencyPatentsUnderReexaminationNumber":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Loss Contingency, Patents Under Reexamination, Number",
                            "label":  "Loss Contingency, Patents Under Reexamination, Number",
                            "terseLabel":  "Number of patents under reexamination"
                            }
                        }
                    },
                "localname":  "LossContingencyPatentsUnderReexaminationNumber",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "alrm_MeasurementInputRevenueVolatilityMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Measurement Input, Revenue Volatility [Member]",
                            "label":  "Measurement Input, Revenue Volatility [Member]",
                            "terseLabel":  "Measurement Input, Revenue Volatility"
                            }
                        }
                    },
                "localname":  "MeasurementInputRevenueVolatilityMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_NotesReceivableConversiontoEquityInvestment":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Notes Receivable, Conversion to Equity Investment",
                            "label":  "Notes Receivable, Conversion to Equity Investment",
                            "terseLabel":  "Conversion of outstanding notes receivable"
                            }
                        }
                    },
                "localname":  "NotesReceivableConversiontoEquityInvestment",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_NotesReceivableConversiontoEquityInvestmentShares":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Notes Receivable, Conversion to Equity Investment, Shares",
                            "label":  "Notes Receivable, Conversion to Equity Investment, Shares",
                            "terseLabel":  "Conversion of outstanding notes receivable (in shares)"
                            }
                        }
                    },
                "localname":  "NotesReceivableConversiontoEquityInvestmentShares",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "alrm_NotesReceivableInterestRateStatedPercentage":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Notes Receivable, Interest Rate, Stated Percentage",
                            "label":  "Notes Receivable, Interest Rate, Stated Percentage",
                            "terseLabel":  "Loan, interest rate"
                            }
                        }
                    },
                "localname":  "NotesReceivableInterestRateStatedPercentage",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "alrm_NotesReceivableMaximumAvailable":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Notes Receivable, Maximum Available",
                            "label":  "Notes Receivable, Maximum Available",
                            "terseLabel":  "Notes receivable, maximum available"
                            }
                        }
                    },
                "localname":  "NotesReceivableMaximumAvailable",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_NotesReceivableNumberOfRenewalOptions":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Notes Receivable, Number Of Renewal Options",
                            "label":  "Notes Receivable, Number Of Renewal Options",
                            "terseLabel":  "Number of renewal options"
                            }
                        }
                    },
                "localname":  "NotesReceivableNumberOfRenewalOptions",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "alrm_NotesReceivableRenewalTerm":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Notes Receivable, Renewal Term",
                            "label":  "Notes Receivable, Renewal Term",
                            "terseLabel":  "Renewal term"
                            }
                        }
                    },
                "localname":  "NotesReceivableRenewalTerm",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "alrm_NumberOfPatentsPurchased":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number Of Patents Purchased",
                            "label":  "Number Of Patents Purchased",
                            "terseLabel":  "Patents purchased"
                            }
                        }
                    },
                "localname":  "NumberOfPatentsPurchased",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "alrm_OpenEyeMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "OpenEye [Member]",
                            "label":  "OpenEye [Member]",
                            "terseLabel":  "OpenEye"
                            }
                        }
                    },
                "localname":  "OpenEyeMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails",
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_OperatingLeaseAvailableLeaseholdImprovementAllowance":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Operating Lease, Available Leasehold Improvement Allowance",
                            "label":  "Operating Lease, Available Leasehold Improvement Allowance",
                            "terseLabel":  "Available leasehold tenant improvement allowance"
                            }
                        }
                    },
                "localname":  "OperatingLeaseAvailableLeaseholdImprovementAllowance",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_OperatingLeaseRightOfUseAssetAmortization":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Operating Lease, Right-Of-Use Asset, Amortization",
                            "label":  "Operating Lease, Right-Of-Use Asset, Amortization",
                            "terseLabel":  "Amortization of operating leases"
                            }
                        }
                    },
                "localname":  "OperatingLeaseRightOfUseAssetAmortization",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_OtherAssetsAllowanceForCreditLoss":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Other Assets, Allowance For Credit Loss",
                            "label":  "Other Assets, Allowance For Credit Loss",
                            "negatedTerseLabel":  "Other assets, allowance for credit loss"
                            }
                        }
                    },
                "localname":  "OtherAssetsAllowanceForCreditLoss",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_OtherAssetsAllowanceForCreditLossCurrent":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Other Assets, Allowance For Credit Loss, Current",
                            "label":  "Other Assets, Allowance For Credit Loss, Current",
                            "negatedTerseLabel":  "Other assets, allowance for credit loss, current"
                            }
                        }
                    },
                "localname":  "OtherAssetsAllowanceForCreditLossCurrent",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_OtherThirdPartySecuredCreditorMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Other Third-Party Secured Creditor [Member]",
                            "label":  "Other Third-Party Secured Creditor [Member]",
                            "terseLabel":  "Other Third-Party Secured Creditor"
                            }
                        }
                    },
                "localname":  "OtherThirdPartySecuredCreditorMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_ParentCompanyAndCertainSubsidiariesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Parent Company And Certain Subsidiaries [Member]",
                            "label":  "Parent Company And Certain Subsidiaries [Member]",
                            "terseLabel":  "Alarm.com and Certain Subsidiaries"
                            }
                        }
                    },
                "localname":  "ParentCompanyAndCertainSubsidiariesMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_PaymentsforAssetAcquisitions":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Payments for Asset Acquisitions",
                            "label":  "Payments for Asset Acquisitions",
                            "terseLabel":  "Payments for asset acquisition"
                            }
                        }
                    },
                "localname":  "PaymentsforAssetAcquisitions",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAssetAcquisitionDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_PaymentstoAcquireBusinessesNetOfWorkingCapitalAdjustment":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Payments to Acquire Businesses, Net Of Working Capital Adjustment",
                            "label":  "Payments to Acquire Businesses, Net Of Working Capital Adjustment",
                            "terseLabel":  "Cash paid, net of working capital adjustment"
                            }
                        }
                    },
                "localname":  "PaymentstoAcquireBusinessesNetOfWorkingCapitalAdjustment",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_ProceedsFromNotesReceivableRepayments":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Proceeds From Notes Receivable, Repayments",
                            "label":  "Proceeds From Notes Receivable, Repayments",
                            "terseLabel":  "Receipt of payment on notes receivable"
                            }
                        }
                    },
                "localname":  "ProceedsFromNotesReceivableRepayments",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_RemainingSubsidiariesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Remaining Subsidiaries [Member]",
                            "label":  "Remaining Subsidiaries [Member]",
                            "terseLabel":  "All Other Subsidiaries"
                            }
                        }
                    },
                "localname":  "RemainingSubsidiariesMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_RevenueVariableConsiderationReserveForSalesReturnsPercentOfRevenue":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Revenue, Variable Consideration, Reserve For Sales Returns, Percent Of Revenue",
                            "label":  "Revenue, Variable Consideration, Reserve For Sales Returns, Percent Of Revenue",
                            "terseLabel":  "Reserve for hardware returns"
                            }
                        }
                    },
                "localname":  "RevenueVariableConsiderationReserveForSalesReturnsPercentOfRevenue",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "alrm_ScenarioFourLeverageRatioMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Scenario Four, Leverage Ratio [Member]",
                            "label":  "Scenario Four, Leverage Ratio [Member]",
                            "terseLabel":  "Scenario Four, Leverage Ratio"
                            }
                        }
                    },
                "localname":  "ScenarioFourLeverageRatioMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_ScenarioOneLeverageRatioMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Scenario One, Leverage Ratio [Member]",
                            "label":  "Scenario One, Leverage Ratio [Member]",
                            "terseLabel":  "Scenario One, Leverage Ratio"
                            }
                        }
                    },
                "localname":  "ScenarioOneLeverageRatioMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_ScenarioThreeLeverageRatioMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Scenario Three, Leverage Ratio [Member]",
                            "label":  "Scenario Three, Leverage Ratio [Member]",
                            "terseLabel":  "Scenario Three, Leverage Ratio"
                            }
                        }
                    },
                "localname":  "ScenarioThreeLeverageRatioMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_ScenarioTwoLeverageRatioMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Scenario Two, Leverage Ratio [Member]",
                            "label":  "Scenario Two, Leverage Ratio [Member]",
                            "terseLabel":  "Scenario Two, Leverage Ratio"
                            }
                        }
                    },
                "localname":  "ScenarioTwoLeverageRatioMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_SegmentConcentrationRiskMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Segment Concentration Risk [Member]",
                            "label":  "Segment Concentration Risk [Member]",
                            "terseLabel":  "Segment Concentration Risk"
                            }
                        }
                    },
                "localname":  "SegmentConcentrationRiskMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_ServiceProviderAMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Service Provider A [Member]",
                            "label":  "Service Provider A [Member]",
                            "terseLabel":  "Service Provider A"
                            }
                        }
                    },
                "localname":  "ServiceProviderAMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_SoftwareLicenseRevenueMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Software License Revenue [Member]",
                            "label":  "Software License Revenue [Member]",
                            "terseLabel":  "Software license revenue"
                            }
                        }
                    },
                "localname":  "SoftwareLicenseRevenueMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_StockIssuedDuringPeriodSharesVestingofCommonStockSubjecttoRepurchase":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Stock Issued During Period, Shares, Vesting of Common Stock Subject to Repurchase",
                            "label":  "Stock Issued During Period, Shares, Vesting of Common Stock Subject to Repurchase",
                            "terseLabel":  "Vesting of common stock subject to repurchase (in shares)"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodSharesVestingofCommonStockSubjecttoRepurchase",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "alrm_StockIssuedDuringPeriodValueVestingofCommonStockSubjecttoRepurchase":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Stock Issued During Period, Value, Vesting of Common Stock Subject to Repurchase",
                            "label":  "Stock Issued During Period, Value, Vesting of Common Stock Subject to Repurchase",
                            "terseLabel":  "Vesting of common stock subject to repurchase"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodValueVestingofCommonStockSubjecttoRepurchase",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_SubleaseLiability":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Sublease Liability",
                            "label":  "Sublease Liability",
                            "terseLabel":  "Subleases"
                            }
                        }
                    },
                "localname":  "SubleaseLiability",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "alrm_TenLargestServiceProvidersMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Ten Largest Service Providers [Member]",
                            "label":  "Ten Largest Service Providers [Member]",
                            "terseLabel":  "Ten Largest Service Providers"
                            }
                        }
                    },
                "localname":  "TenLargestServiceProvidersMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_TermLoanMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Term Loan [Member]",
                            "label":  "Term Loan [Member]",
                            "terseLabel":  "Term Loan"
                            }
                        }
                    },
                "localname":  "TermLoanMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_TreasuryStockPolicyTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Treasury Stock [Policy Text Block]",
                            "label":  "Treasury Stock [Policy Text Block]",
                            "terseLabel":  "Treasury Stock"
                            }
                        }
                    },
                "localname":  "TreasuryStockPolicyTextBlock",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "alrm_TrustedServiceProviders":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Trusted Service Providers",
                            "label":  "Trusted Service Providers",
                            "terseLabel":  "Number of trusted service providers (more than)"
                            }
                        }
                    },
                "localname":  "TrustedServiceProviders",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/OrganizationDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "alrm_TwoThousandFifteenEquityIncentivePlanMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Two Thousand Fifteen Equity Incentive Plan [Member]",
                            "label":  "Two Thousand Fifteen Equity Incentive Plan [Member]",
                            "terseLabel":  "2015 Equity Incentive Plan"
                            }
                        }
                    },
                "localname":  "TwoThousandFifteenEquityIncentivePlanMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_TwoThousandSeventeenFacilityMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Two Thousand Seventeen Facility [Member]",
                            "label":  "Two Thousand Seventeen Facility [Member]",
                            "terseLabel":  "2017 Facility"
                            }
                        }
                    },
                "localname":  "TwoThousandSeventeenFacilityMember",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_VariableRateComponentAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Variable Rate Component [Axis]",
                            "label":  "Variable Rate Component [Axis]",
                            "terseLabel":  "Variable Rate Component [Axis]"
                            }
                        }
                    },
                "localname":  "VariableRateComponentAxis",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "alrm_VariableRateComponentDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "[Domain] for Variable Rate Component [Axis]",
                            "label":  "Variable Rate Component [Domain]",
                            "terseLabel":  "Variable Rate Component [Domain]"
                            }
                        }
                    },
                "localname":  "VariableRateComponentDomain",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "alrm_VivintInc.vs.Alarm.comHoldingsInc.Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Vivint, Inc. vs.  Alarm.com Holdings, Inc. [Member]",
                            "label":  "Vivint, Inc. vs.  Alarm.com Holdings, Inc. [Member]",
                            "terseLabel":  "Vivint, Inc. vs.  Alarm.com Holdings, Inc"
                            }
                        }
                    },
                "localname":  "VivintInc.vs.Alarm.comHoldingsInc.Member",
                "nsuri":  "http://www.alarm.com/20200331",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "dei_AmendmentFlag":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.",
                            "label":  "Amendment Flag",
                            "terseLabel":  "Amendment Flag"
                            }
                        }
                    },
                "localname":  "AmendmentFlag",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_CityAreaCode":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Area code of city",
                            "label":  "City Area Code",
                            "terseLabel":  "City Area Code"
                            }
                        }
                    },
                "localname":  "CityAreaCode",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_CoverAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Cover page.",
                            "label":  "Cover [Abstract]"
                            }
                        }
                    },
                "localname":  "CoverAbstract",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "dei_CurrentFiscalYearEndDate":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "End date of current fiscal year in the format --MM-DD.",
                            "label":  "Current Fiscal Year End Date",
                            "terseLabel":  "Current Fiscal Year End Date"
                            }
                        }
                    },
                "localname":  "CurrentFiscalYearEndDate",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "gMonthDayItemType"
                },
            "dei_DocumentFiscalPeriodFocus":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fiscal period values are FY, Q1, Q2, and Q3.  1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.",
                            "label":  "Document Fiscal Period Focus",
                            "terseLabel":  "Document Fiscal Period Focus"
                            }
                        }
                    },
                "localname":  "DocumentFiscalPeriodFocus",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "fiscalPeriodItemType"
                },
            "dei_DocumentFiscalYearFocus":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "This is focus fiscal year of the document report in CCYY format.  For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus.  Example: 2006.",
                            "label":  "Document Fiscal Year Focus",
                            "terseLabel":  "Document Fiscal Year Focus"
                            }
                        }
                    },
                "localname":  "DocumentFiscalYearFocus",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "gYearItemType"
                },
            "dei_DocumentPeriodEndDate":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The end date of the period reflected on the cover page if a periodic report.  For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date.  The format of the date is CCYY-MM-DD.",
                            "label":  "Document Period End Date",
                            "terseLabel":  "Document Period End Date"
                            }
                        }
                    },
                "localname":  "DocumentPeriodEndDate",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "dateItemType"
                },
            "dei_DocumentQuarterlyReport":  {
                "auth_ref":  [
                    "r410"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true only for a form used as an quarterly report.",
                            "label":  "Document Quarterly Report",
                            "terseLabel":  "Document Quarterly Report"
                            }
                        }
                    },
                "localname":  "DocumentQuarterlyReport",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_DocumentTransitionReport":  {
                "auth_ref":  [
                    "r411"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true only for a form used as a transition report.",
                            "label":  "Document Transition Report",
                            "terseLabel":  "Document Transition Report"
                            }
                        }
                    },
                "localname":  "DocumentTransitionReport",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_DocumentType":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc).  The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.",
                            "label":  "Document Type",
                            "terseLabel":  "Document Type"
                            }
                        }
                    },
                "localname":  "DocumentType",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "submissionTypeItemType"
                },
            "dei_EntityAddressAddressLine1":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Address Line 1 such as Attn, Building Name, Street Name",
                            "label":  "Entity Address, Address Line One",
                            "terseLabel":  "Entity Address, Address Line One"
                            }
                        }
                    },
                "localname":  "EntityAddressAddressLine1",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityAddressAddressLine2":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Address Line 2 such as Street or Suite number",
                            "label":  "Entity Address, Address Line Two",
                            "terseLabel":  "Entity Address, Address Line Two"
                            }
                        }
                    },
                "localname":  "EntityAddressAddressLine2",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityAddressCityOrTown":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Name of the City or Town",
                            "label":  "Entity Address, City or Town",
                            "terseLabel":  "Entity Address, City or Town"
                            }
                        }
                    },
                "localname":  "EntityAddressCityOrTown",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityAddressPostalZipCode":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Code for the postal or zip code",
                            "label":  "Entity Address, Postal Zip Code",
                            "terseLabel":  "Entity Address, Postal Zip Code"
                            }
                        }
                    },
                "localname":  "EntityAddressPostalZipCode",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityAddressStateOrProvince":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Name of the state or province.",
                            "label":  "Entity Address, State or Province",
                            "terseLabel":  "Entity Address, State or Province"
                            }
                        }
                    },
                "localname":  "EntityAddressStateOrProvince",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "stateOrProvinceItemType"
                },
            "dei_EntityCentralIndexKey":  {
                "auth_ref":  [
                    "r412"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC.  It is commonly abbreviated as CIK.",
                            "label":  "Entity Central Index Key",
                            "terseLabel":  "Entity Central Index Key"
                            }
                        }
                    },
                "localname":  "EntityCentralIndexKey",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "centralIndexKeyItemType"
                },
            "dei_EntityCommonStockSharesOutstanding":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report.  Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.",
                            "label":  "Entity Common Stock, Shares Outstanding",
                            "terseLabel":  "Entity Common Stock, Shares Outstanding (in shares)"
                            }
                        }
                    },
                "localname":  "EntityCommonStockSharesOutstanding",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "dei_EntityCurrentReportingStatus":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days.  This information should be based on the registrant's current or most recent filing containing the related disclosure.",
                            "label":  "Entity Current Reporting Status",
                            "terseLabel":  "Entity Current Reporting Status"
                            }
                        }
                    },
                "localname":  "EntityCurrentReportingStatus",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_EntityDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "All the names of the entities being reported upon in a document.  Any legal structure used to conduct activities or to hold assets.  Some examples of such structures are corporations, partnerships, limited liability companies, grantor trusts, and other trusts.  This item does not include business and geographical segments which are included in the geographical or business segments domains.",
                            "label":  "Entity [Domain]",
                            "terseLabel":  "Entity [Domain]"
                            }
                        }
                    },
                "localname":  "EntityDomain",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "dei_EntityEmergingGrowthCompany":  {
                "auth_ref":  [
                    "r412"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Indicate if registrant meets the emerging growth company criteria.",
                            "label":  "Entity Emerging Growth Company",
                            "terseLabel":  "Entity Emerging Growth Company"
                            }
                        }
                    },
                "localname":  "EntityEmergingGrowthCompany",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntityFileNumber":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Commission file number.  The field allows up to 17 characters.  The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.",
                            "label":  "Entity File Number",
                            "terseLabel":  "Entity File Number"
                            }
                        }
                    },
                "localname":  "EntityFileNumber",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "fileNumberItemType"
                },
            "dei_EntityFilerCategory":  {
                "auth_ref":  [
                    "r412"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Indicate whether the registrant is one of the following:  Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer.  Definitions of these categories are stated in Rule 12b-2 of the Exchange Act.  This information should be based on the registrant's current or most recent filing containing the related disclosure.",
                            "label":  "Entity Filer Category",
                            "terseLabel":  "Entity Filer Category"
                            }
                        }
                    },
                "localname":  "EntityFilerCategory",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "filerCategoryItemType"
                },
            "dei_EntityIncorporationStateCountryCode":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Two-character EDGAR code representing the state or country of incorporation.",
                            "label":  "Entity Incorporation, State or Country Code",
                            "terseLabel":  "Entity Incorporation, State or Country Code"
                            }
                        }
                    },
                "localname":  "EntityIncorporationStateCountryCode",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "edgarStateCountryItemType"
                },
            "dei_EntityInteractiveDataCurrent":  {
                "auth_ref":  [
                    "r413"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).",
                            "label":  "Entity Interactive Data Current",
                            "terseLabel":  "Entity Interactive Data Current"
                            }
                        }
                    },
                "localname":  "EntityInteractiveDataCurrent",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_EntityRegistrantName":  {
                "auth_ref":  [
                    "r412"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.",
                            "label":  "Entity Registrant Name",
                            "terseLabel":  "Entity Registrant Name"
                            }
                        }
                    },
                "localname":  "EntityRegistrantName",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityShellCompany":  {
                "auth_ref":  [
                    "r412"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.",
                            "label":  "Entity Shell Company",
                            "terseLabel":  "Entity Shell Company"
                            }
                        }
                    },
                "localname":  "EntityShellCompany",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntitySmallBusiness":  {
                "auth_ref":  [
                    "r412"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Indicates that the company is a Smaller Reporting Company (SRC).",
                            "label":  "Entity Small Business",
                            "terseLabel":  "Entity Small Business"
                            }
                        }
                    },
                "localname":  "EntitySmallBusiness",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntityTaxIdentificationNumber":  {
                "auth_ref":  [
                    "r412"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.",
                            "label":  "Entity Tax Identification Number",
                            "terseLabel":  "Entity Tax Identification Number"
                            }
                        }
                    },
                "localname":  "EntityTaxIdentificationNumber",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "employerIdItemType"
                },
            "dei_LegalEntityAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The set of legal entities associated with a report.",
                            "label":  "Legal Entity [Axis]",
                            "terseLabel":  "Legal Entity [Axis]"
                            }
                        }
                    },
                "localname":  "LegalEntityAxis",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "dei_LocalPhoneNumber":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Local phone number for entity.",
                            "label":  "Local Phone Number",
                            "terseLabel":  "Local Phone Number"
                            }
                        }
                    },
                "localname":  "LocalPhoneNumber",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_Security12bTitle":  {
                "auth_ref":  [
                    "r408"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Title of a 12(b) registered security.",
                            "label":  "Title of 12(b) Security",
                            "terseLabel":  "Title of 12(b) Security"
                            }
                        }
                    },
                "localname":  "Security12bTitle",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "securityTitleItemType"
                },
            "dei_SecurityExchangeName":  {
                "auth_ref":  [
                    "r409"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Name of the Exchange on which a security is registered.",
                            "label":  "Security Exchange Name",
                            "terseLabel":  "Security Exchange Name"
                            }
                        }
                    },
                "localname":  "SecurityExchangeName",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "edgarExchangeCodeItemType"
                },
            "dei_TradingSymbol":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Trading symbol of an instrument as listed on an exchange.",
                            "label":  "Trading Symbol",
                            "terseLabel":  "Trading Symbol"
                            }
                        }
                    },
                "localname":  "TradingSymbol",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CoverPage"
                    ],
                "xbrltype":  "tradingSymbolItemType"
                },
            "srt_ConsolidatedEntitiesAxis":  {
                "auth_ref":  [
                    "r406"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Consolidated Entities [Axis]",
                            "terseLabel":  "Consolidated Entities [Axis]"
                            }
                        }
                    },
                "localname":  "ConsolidatedEntitiesAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_ConsolidatedEntitiesDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Consolidated Entities [Domain]",
                            "terseLabel":  "Consolidated Entities [Domain]"
                            }
                        }
                    },
                "localname":  "ConsolidatedEntitiesDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ConsolidationItemsAxis":  {
                "auth_ref":  [
                    "r129",
                    "r135"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Consolidation Items [Axis]",
                            "terseLabel":  "Consolidation Items [Axis]"
                            }
                        }
                    },
                "localname":  "ConsolidationItemsAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_ConsolidationItemsDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Consolidation Items [Domain]",
                            "terseLabel":  "Consolidation Items [Domain]"
                            }
                        }
                    },
                "localname":  "ConsolidationItemsDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_EquityMethodInvesteeNameDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Investment, Name [Domain]",
                            "terseLabel":  "Investment, Name [Domain]"
                            }
                        }
                    },
                "localname":  "EquityMethodInvesteeNameDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_LitigationCaseAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Litigation Case [Axis]",
                            "terseLabel":  "Litigation Case [Axis]"
                            }
                        }
                    },
                "localname":  "LitigationCaseAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_LitigationCaseTypeDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Litigation Case [Domain]",
                            "terseLabel":  "Litigation Case [Domain]"
                            }
                        }
                    },
                "localname":  "LitigationCaseTypeDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_MajorCustomersAxis":  {
                "auth_ref":  [
                    "r138",
                    "r238",
                    "r242",
                    "r402"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Customer [Axis]",
                            "terseLabel":  "Customer [Axis]"
                            }
                        }
                    },
                "localname":  "MajorCustomersAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_MaximumMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Maximum [Member]",
                            "terseLabel":  "Maximum"
                            }
                        }
                    },
                "localname":  "MaximumMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails",
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_MinimumMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Minimum [Member]",
                            "terseLabel":  "Minimum"
                            }
                        }
                    },
                "localname":  "MinimumMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails",
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_NameOfMajorCustomerDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Customer [Domain]",
                            "terseLabel":  "Customer [Domain]"
                            }
                        }
                    },
                "localname":  "NameOfMajorCustomerDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ProductOrServiceAxis":  {
                "auth_ref":  [
                    "r137",
                    "r238",
                    "r241",
                    "r400",
                    "r401"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Product and Service [Axis]",
                            "terseLabel":  "Product and Service [Axis]"
                            }
                        }
                    },
                "localname":  "ProductOrServiceAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_ProductsAndServicesDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Product and Service [Domain]",
                            "terseLabel":  "Product and Service [Domain]"
                            }
                        }
                    },
                "localname":  "ProductsAndServicesDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_RangeAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Statistical Measurement [Axis]",
                            "terseLabel":  "Statistical Measurement [Axis]"
                            }
                        }
                    },
                "localname":  "RangeAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails",
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_RangeMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Statistical Measurement [Domain]",
                            "terseLabel":  "Statistical Measurement [Domain]"
                            }
                        }
                    },
                "localname":  "RangeMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails",
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis":  {
                "auth_ref":  [
                    "r156"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Investment, Name [Axis]",
                            "terseLabel":  "Investment, Name [Axis]"
                            }
                        }
                    },
                "localname":  "ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_WeightedAverageMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Weighted Average [Member]",
                            "terseLabel":  "Weighted Average"
                            }
                        }
                    },
                "localname":  "WeightedAverageMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AccountingPoliciesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Accounting Policies [Abstract]"
                            }
                        }
                    },
                "localname":  "AccountingPoliciesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AccountsNotesAndLoansReceivableLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Accounts, Notes, Loans and Financing Receivable [Line Items]",
                            "terseLabel":  "Accounts, Notes, Loans and Financing Receivable [Line Items]"
                            }
                        }
                    },
                "localname":  "AccountsNotesAndLoansReceivableLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetNarrativeDetails",
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails",
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis":  {
                "auth_ref":  [
                    "r46"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of receivable.",
                            "label":  "Receivable Type [Axis]",
                            "terseLabel":  "Receivable Type [Axis]"
                            }
                        }
                    },
                "localname":  "AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAllowanceForCreditLossesNarrativeDetails",
                    "http://www.alarm.com/role/OtherAssetsAmortizedCostDetails",
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails",
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis":  {
                "auth_ref":  [
                    "r46"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by legal entity of counterparty.  A counterparty is the other party that participates in a financial transaction.",
                            "label":  "Legal Entity of Counterparty, Type [Axis]",
                            "terseLabel":  "Legal Entity of Counterparty, Type [Axis]"
                            }
                        }
                    },
                "localname":  "AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for accounts payable, accrued expenses, and other liabilities that are classified as current at the end of the reporting period.",
                            "label":  "Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]",
                            "terseLabel":  "Liabilities"
                            }
                        }
                    },
                "localname":  "AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/Liabilities"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_AccountsPayableCurrent":  {
                "auth_ref":  [
                    "r34"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LiabilitiesComponentsOfAccountsPayableAccruedExpensesAndOtherCurrentLiabilitiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "alrm_AccountsPayableAccruedLiabilitiesandOtherCurrentLiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.  Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
                            "label":  "Accounts Payable, Current",
                            "terseLabel":  "Accounts payable"
                            }
                        }
                    },
                "localname":  "AccountsPayableCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LiabilitiesComponentsOfAccountsPayableAccruedExpensesAndOtherCurrentLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccountsPayableRelatedPartiesCurrent":  {
                "auth_ref":  [
                    "r34",
                    "r88",
                    "r351",
                    "r352",
                    "r353"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount for accounts payable to related parties.  Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
                            "label":  "Accounts Payable, Related Parties, Current",
                            "terseLabel":  "Accounts payable to related party (less than)"
                            }
                        }
                    },
                "localname":  "AccountsPayableRelatedPartiesCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccountsReceivableGrossCurrent":  {
                "auth_ref":  [
                    "r140",
                    "r141"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfComponentsOfAccountsReceivableDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_AccountsReceivableNetCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.",
                            "label":  "Accounts Receivable, before Allowance for Credit Loss, Current",
                            "terseLabel":  "Accounts receivable"
                            }
                        }
                    },
                "localname":  "AccountsReceivableGrossCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfComponentsOfAccountsReceivableDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccountsReceivableNetCurrent":  {
                "auth_ref":  [
                    "r4",
                    "r20",
                    "r140",
                    "r141",
                    "r239"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfComponentsOfAccountsReceivableDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_AssetsCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.",
                            "label":  "Accounts Receivable, after Allowance for Credit Loss, Current",
                            "terseLabel":  "Accounts receivable, net",
                            "totalLabel":  "Accounts receivable, net",
                            "verboseLabel":  "Accounts receivable, net of allowance for credit losses of $4,789 and $2,584, respectively, and net of allowance for product returns of $1,224 and $1,075, respectively"
                            }
                        }
                    },
                "localname":  "AccountsReceivableNetCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfComponentsOfAccountsReceivableDetails",
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails",
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccruedLiabilitiesCurrent":  {
                "auth_ref":  [
                    "r37"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LiabilitiesComponentsOfAccountsPayableAccruedExpensesAndOtherCurrentLiabilitiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "alrm_AccountsPayableAccruedLiabilitiesandOtherCurrentLiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered.  Examples include taxes, interest, rent and utilities.  Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
                            "label":  "Accrued Liabilities, Current",
                            "terseLabel":  "Accrued expenses"
                            }
                        }
                    },
                "localname":  "AccruedLiabilitiesCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LiabilitiesComponentsOfAccountsPayableAccruedExpensesAndOtherCurrentLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife":  {
                "auth_ref":  [
                    "r195"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
                            "label":  "Acquired Finite-lived Intangible Assets, Weighted Average Useful Life",
                            "terseLabel":  "Weighted-average estimated useful life of intangible assets acquired"
                            }
                        }
                    },
                "localname":  "AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_AdditionalPaidInCapital":  {
                "auth_ref":  [
                    "r21"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders.  Includes adjustments to additional paid in capital.  Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees.  Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock.  For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock.  For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.",
                            "label":  "Additional Paid in Capital",
                            "terseLabel":  "Additional paid-in capital"
                            }
                        }
                    },
                "localname":  "AdditionalPaidInCapital",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AdditionalPaidInCapitalMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders.",
                            "label":  "Additional Paid-in Capital [Member]",
                            "terseLabel":  "Additional Paid-In Capital"
                            }
                        }
                    },
                "localname":  "AdditionalPaidInCapitalMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue":  {
                "auth_ref":  [
                    "r248",
                    "r250",
                    "r264",
                    "r265"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.",
                            "label":  "APIC, Share-based Payment Arrangement, Increase for Cost Recognition",
                            "terseLabel":  "Stock-based compensation expense"
                            }
                        }
                    },
                "localname":  "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]",
                            "terseLabel":  "Adjustments to reconcile net income to net cash from / (used in) operating activities:"
                            }
                        }
                    },
                "localname":  "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AdvancesOnInventoryPurchases":  {
                "auth_ref":  [
                    "r48"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying value of capitalized payments made in advance for inventory that is expected to be received within one year or the normal operating cycle, if longer.",
                            "label":  "Advances on Inventory Purchases",
                            "terseLabel":  "Advances on inventory purchases"
                            }
                        }
                    },
                "localname":  "AdvancesOnInventoryPurchases",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAllowanceForCreditLossesNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AllOtherSegmentsMember":  {
                "auth_ref":  [
                    "r122",
                    "r123",
                    "r124",
                    "r125",
                    "r126",
                    "r127"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Operating segments classified as other.  Excludes intersegment elimination and reconciling items.",
                            "label":  "Other Segments [Member]",
                            "terseLabel":  "Other"
                            }
                        }
                    },
                "localname":  "AllOtherSegmentsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfGoodwillDetails",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AllocatedShareBasedCompensationExpense":  {
                "auth_ref":  [
                    "r250",
                    "r260",
                    "r263"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of expense for award under share-based payment arrangement.  Excludes amount capitalized.",
                            "label":  "Share-based Payment Arrangement, Expense",
                            "verboseLabel":  "Stock-based compensation expense"
                            }
                        }
                    },
                "localname":  "AllocatedShareBasedCompensationExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock":  {
                "auth_ref":  [
                    "r144",
                    "r163"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of allowance for credit loss on financing receivable.",
                            "label":  "Financing Receivable, Allowance for Credit Loss [Table Text Block]",
                            "terseLabel":  "Schedule of Changes in Allowance for Credit Losses for Accounts Receivable"
                            }
                        }
                    },
                "localname":  "AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetTables",
                    "http://www.alarm.com/role/OtherAssetsOtherAssetsTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_AllowanceForDoubtfulAccountsReceivable":  {
                "auth_ref":  [
                    "r147",
                    "r157",
                    "r159",
                    "r162"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfComponentsOfAccountsReceivableDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_AccountsReceivableNetCurrent",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of allowance for credit loss on accounts receivable.",
                            "label":  "Accounts Receivable, Allowance for Credit Loss",
                            "negatedLabel":  "Allowance for credit losses",
                            "negatedPeriodEndLabel":  "End of period balance, subsequent to adoption of Topic 326",
                            "negatedPeriodStartLabel":  "Beginning of period balance, prior to adoption of Topic 326",
                            "negatedTerseLabel":  "Accounts receivable, allowance for credit losses"
                            }
                        }
                    },
                "localname":  "AllowanceForDoubtfulAccountsReceivable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfComponentsOfAccountsReceivableDetails",
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails",
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Accounts Receivable, Allowance for Credit Loss [Roll Forward]",
                            "terseLabel":  "Accounts Receivable, Allowance for Credit Loss [Roll Forward]"
                            }
                        }
                    },
                "localname":  "AllowanceForDoubtfulAccountsReceivableRollforward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs":  {
                "auth_ref":  [
                    "r161"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of direct write-downs of accounts receivable charged against the allowance.",
                            "label":  "Accounts Receivable, Allowance for Credit Loss, Writeoff",
                            "terseLabel":  "Write-offs"
                            }
                        }
                    },
                "localname":  "AllowanceForDoubtfulAccountsReceivableWriteOffs",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AmortizationOfFinancingCosts":  {
                "auth_ref":  [
                    "r58",
                    "r76",
                    "r334"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of amortization expense attributable to debt issuance costs.",
                            "label":  "Amortization of Debt Issuance Costs",
                            "terseLabel":  "Amortization of debt issuance costs"
                            }
                        }
                    },
                "localname":  "AmortizationOfFinancingCosts",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AmortizationOfIntangibleAssets":  {
                "auth_ref":  [
                    "r76",
                    "r192",
                    "r199"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.  As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.",
                            "label":  "Amortization of Intangible Assets",
                            "negatedLabel":  "Amortization",
                            "terseLabel":  "Amortization"
                            }
                        }
                    },
                "localname":  "AmortizationOfIntangibleAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetNarrativeDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfNetCarryingAmountOfIntangibleAssetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount":  {
                "auth_ref":  [
                    "r101"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.",
                            "label":  "Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount",
                            "terseLabel":  "Anti-dilutive securities excluded from the calculation of diluted weighted average common shares outstanding"
                            }
                        }
                    },
                "localname":  "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis":  {
                "auth_ref":  [
                    "r101"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of antidilutive security.",
                            "label":  "Antidilutive Securities [Axis]",
                            "terseLabel":  "Antidilutive Securities [Axis]"
                            }
                        }
                    },
                "localname":  "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]",
                            "terseLabel":  "Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]"
                            }
                        }
                    },
                "localname":  "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AntidilutiveSecuritiesNameDomain":  {
                "auth_ref":  [
                    "r101"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Incremental common shares attributable to securities that were not included in diluted earnings per share (EPS) because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.",
                            "label":  "Antidilutive Securities, Name [Domain]",
                            "terseLabel":  "Antidilutive Securities, Name [Domain]"
                            }
                        }
                    },
                "localname":  "AntidilutiveSecuritiesNameDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_Assets":  {
                "auth_ref":  [
                    "r131",
                    "r376",
                    "r391"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Sum of the carrying amounts as of the balance sheet date of all assets that are recognized.  Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
                            "label":  "Assets",
                            "terseLabel":  "Total Assets",
                            "totalLabel":  "Total assets"
                            }
                        }
                    },
                "localname":  "Assets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AssetsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Assets [Abstract]",
                            "terseLabel":  "Assets"
                            }
                        }
                    },
                "localname":  "AssetsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AssetsCurrent":  {
                "auth_ref":  [
                    "r6",
                    "r7",
                    "r49"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer).  Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
                            "label":  "Assets, Current",
                            "totalLabel":  "Total current assets"
                            }
                        }
                    },
                "localname":  "AssetsCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AssetsCurrentAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Assets, Current [Abstract]",
                            "terseLabel":  "Current assets:"
                            }
                        }
                    },
                "localname":  "AssetsCurrentAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AssetsFairValueDisclosure":  {
                "auth_ref":  [
                    "r315"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
                            "label":  "Assets, Fair Value Disclosure",
                            "totalLabel":  "Total"
                            }
                        }
                    },
                "localname":  "AssetsFairValueDisclosure",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AssetsFairValueDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Assets, Fair Value Disclosure [Abstract]",
                            "terseLabel":  "Assets:"
                            }
                        }
                    },
                "localname":  "AssetsFairValueDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AwardTypeAxis":  {
                "auth_ref":  [
                    "r252",
                    "r261"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of award under share-based payment arrangement.",
                            "label":  "Award Type [Axis]",
                            "terseLabel":  "Award Type [Axis]"
                            }
                        }
                    },
                "localname":  "AwardTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails",
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_BalanceSheetLocationAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by location on balance sheet (statement of financial position).",
                            "label":  "Balance Sheet Location [Axis]",
                            "terseLabel":  "Balance Sheet Location [Axis]"
                            }
                        }
                    },
                "localname":  "BalanceSheetLocationAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_BalanceSheetLocationDomain":  {
                "auth_ref":  [
                    "r311",
                    "r312"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Location in the balance sheet (statement of financial position).",
                            "label":  "Balance Sheet Location [Domain]",
                            "terseLabel":  "Balance Sheet Location [Domain]"
                            }
                        }
                    },
                "localname":  "BalanceSheetLocationDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_BasisOfAccountingPolicyPolicyTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).",
                            "label":  "Basis of Accounting, Policy [Policy Text Block]",
                            "terseLabel":  "Basis of Presentation"
                            }
                        }
                    },
                "localname":  "BasisOfAccountingPolicyPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock":  {
                "auth_ref":  [
                    "r89"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for the basis of presentation and significant accounting policies concepts.  Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).  Accounting policies describe all significant accounting policies of the reporting entity.",
                            "label":  "Basis of Presentation and Significant Accounting Policies [Text Block]",
                            "terseLabel":  "Basis of Presentation and Summary of Significant Accounting Policies"
                            }
                        }
                    },
                "localname":  "BasisOfPresentationAndSignificantAccountingPoliciesTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_BusinessAcquisitionAcquireeDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Identification of the acquiree in a material business combination (or series of individually immaterial business combinations), which may include the name or other type of identification of the acquiree.",
                            "label":  "Business Acquisition, Acquiree [Domain]",
                            "terseLabel":  "Business Acquisition, Acquiree [Domain]"
                            }
                        }
                    },
                "localname":  "BusinessAcquisitionAcquireeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_BusinessAcquisitionAxis":  {
                "auth_ref":  [
                    "r287",
                    "r288"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by business combination or series of individually immaterial business combinations.",
                            "label":  "Business Acquisition [Axis]",
                            "terseLabel":  "Business Acquisition [Axis]"
                            }
                        }
                    },
                "localname":  "BusinessAcquisitionAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_BusinessAcquisitionLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Business Acquisition [Line Items]",
                            "terseLabel":  "Business Acquisition [Line Items]"
                            }
                        }
                    },
                "localname":  "BusinessAcquisitionLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/AcquisitionsAssetAcquisitionDetails",
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired":  {
                "auth_ref":  [
                    "r286"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage of voting equity interests acquired at the acquisition date in the business combination.",
                            "label":  "Business Acquisition, Percentage of Voting Interests Acquired",
                            "terseLabel":  "Percentage of business acquired"
                            }
                        }
                    },
                "localname":  "BusinessAcquisitionPercentageOfVotingInterestsAcquired",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue":  {
                "auth_ref":  [
                    "r291"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  12.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.",
                            "label":  "Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value",
                            "negatedLabel":  "Redeemable noncontrolling interest"
                            }
                        }
                    },
                "localname":  "BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationConsiderationTransferred1":  {
                "auth_ref":  [
                    "r297",
                    "r298",
                    "r300"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.",
                            "label":  "Business Combination, Consideration Transferred",
                            "terseLabel":  "Total consideration"
                            }
                        }
                    },
                "localname":  "BusinessCombinationConsiderationTransferred1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationConsiderationTransferredAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Business Combination, Consideration Transferred [Abstract]",
                            "terseLabel":  "Calculation of Purchase Consideration:"
                            }
                        }
                    },
                "localname":  "BusinessCombinationConsiderationTransferredAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1":  {
                "auth_ref":  [
                    "r75",
                    "r304"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  9.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.",
                            "label":  "Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability",
                            "terseLabel":  "Change in fair value of contingent liability",
                            "verboseLabel":  "Increase (decrease) in fair value of contingent liability"
                            }
                        }
                    },
                "localname":  "BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh":  {
                "auth_ref":  [
                    "r303"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.",
                            "label":  "Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High",
                            "terseLabel":  "Additional earn-out"
                            }
                        }
                    },
                "localname":  "BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationContingentConsiderationLiability":  {
                "auth_ref":  [
                    "r296",
                    "r299",
                    "r302"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LiabilitiesFairValueDisclosure",
                        "weight":  1.0
                        },
                    "http://www.alarm.com/role/LiabilitiesOtherLiabilitiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_OtherLiabilitiesNoncurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of liability recognized arising from contingent consideration in a business combination.",
                            "label":  "Business Combination, Contingent Consideration, Liability",
                            "terseLabel":  "Contingent earnout",
                            "verboseLabel":  "Contingent consideration liability from acquisitions"
                            }
                        }
                    },
                "localname":  "BusinessCombinationContingentConsiderationLiability",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails",
                    "http://www.alarm.com/role/LiabilitiesOtherLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput":  {
                "auth_ref":  [
                    "r320"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Value of input used to measure contingent consideration liability from business combination.",
                            "label":  "Business Combination, Contingent Consideration, Liability, Measurement Input",
                            "terseLabel":  "Measurement input"
                            }
                        }
                    },
                "localname":  "BusinessCombinationContingentConsiderationLiabilityMeasurementInput",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "decimalItemType"
                },
            "us-gaap_BusinessCombinationDisclosureTextBlock":  {
                "auth_ref":  [
                    "r305"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities.  The disclosure may include leverage buyout transactions (as applicable).",
                            "label":  "Business Combination Disclosure [Text Block]",
                            "terseLabel":  "Acquisitions"
                            }
                        }
                    },
                "localname":  "BusinessCombinationDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/Acquisitions"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred":  {
                "auth_ref":  [
                    "r292"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.",
                            "label":  "Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred",
                            "terseLabel":  "Purchase price adjustment"
                            }
                        }
                    },
                "localname":  "BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents":  {
                "auth_ref":  [
                    "r290"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date.  Includes other kinds of accounts that have the general characteristics of demand deposits.  Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents",
                            "terseLabel":  "Cash"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther":  {
                "auth_ref":  [
                    "r290"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.",
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other",
                            "terseLabel":  "Other current assets"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables":  {
                "auth_ref":  [
                    "r290"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.",
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables",
                            "terseLabel":  "Accounts receivable"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable":  {
                "auth_ref":  [
                    "r290"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.",
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable",
                            "negatedLabel":  "Accounts payable"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther":  {
                "auth_ref":  [
                    "r290"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  9.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.",
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other",
                            "negatedLabel":  "Other current liabilities"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles":  {
                "auth_ref":  [
                    "r289",
                    "r290"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of identifiable intangible assets recognized as of the acquisition date.",
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles",
                            "verboseLabel":  "Intangible assets acquired"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory":  {
                "auth_ref":  [
                    "r289",
                    "r290"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of inventory recognized as of the acquisition date.",
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory",
                            "terseLabel":  "Inventory"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities":  {
                "auth_ref":  [
                    "r290"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  11.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.",
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities",
                            "negatedTerseLabel":  "Deferred revenue"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment":  {
                "auth_ref":  [
                    "r289",
                    "r290"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of property, plant, and equipment recognized as of the acquisition date.",
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment",
                            "terseLabel":  "Property and equipment"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet":  {
                "auth_ref":  [
                    "r290"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.",
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net",
                            "totalLabel":  "Total estimated tangible and intangible net assets"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]",
                            "terseLabel":  "Estimated Tangible and Intangible Net Assets:"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_BusinessCombinationsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Business Combinations [Abstract]"
                            }
                        }
                    },
                "localname":  "BusinessCombinationsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_CapitalizedContractCostAmortization":  {
                "auth_ref":  [
                    "r183"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.",
                            "label":  "Capitalized Contract Cost, Amortization",
                            "negatedTerseLabel":  "Amortization of contract assets",
                            "terseLabel":  "Amortization of capitalized commission costs"
                            }
                        }
                    },
                "localname":  "CapitalizedContractCostAmortization",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersContractAssetAndLiabilityBalancesDetails",
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CapitalizedContractCostAxis":  {
                "auth_ref":  [
                    "r182"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by cost capitalized in obtaining or fulfilling contract with customer.",
                            "label":  "Capitalized Contract Cost [Axis]",
                            "terseLabel":  "Capitalized Contract Cost [Axis]"
                            }
                        }
                    },
                "localname":  "CapitalizedContractCostAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_CapitalizedContractCostDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Cost capitalized in obtaining and fulfilling contract with customer.",
                            "label":  "Capitalized Contract Cost [Domain]",
                            "terseLabel":  "Capitalized Contract Cost [Domain]"
                            }
                        }
                    },
                "localname":  "CapitalizedContractCostDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_CashAndCashEquivalentsAtCarryingValue":  {
                "auth_ref":  [
                    "r2",
                    "r31",
                    "r78"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_AssetsCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of currency on hand as well as demand deposits with banks or financial institutions.  Includes other kinds of accounts that have the general characteristics of demand deposits.  Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.  Excludes cash and cash equivalents within disposal group and discontinued operation.",
                            "label":  "Cash and Cash Equivalents, at Carrying Value",
                            "terseLabel":  "Cash and cash equivalents"
                            }
                        }
                    },
                "localname":  "CashAndCashEquivalentsAtCarryingValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CashAndCashEquivalentsAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of cash and cash equivalent balance.",
                            "label":  "Cash and Cash Equivalents [Axis]",
                            "terseLabel":  "Cash and Cash Equivalents [Axis]"
                            }
                        }
                    },
                "localname":  "CashAndCashEquivalentsAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_CashAndCashEquivalentsFairValueDisclosure":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_AssetsFairValueDisclosure",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fair value portion of currency on hand as well as demand deposits with banks or financial institutions.  Includes other kinds of accounts that have the general characteristics of demand deposits.  Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
                            "label":  "Cash and Cash Equivalents, Fair Value Disclosure",
                            "terseLabel":  "Money market accounts"
                            }
                        }
                    },
                "localname":  "CashAndCashEquivalentsFairValueDisclosure",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents":  {
                "auth_ref":  [
                    "r73",
                    "r78",
                    "r79"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage.  Excludes amount for disposal group and discontinued operations.  Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.  Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
                            "label":  "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents",
                            "periodEndLabel":  "Cash and cash equivalents at end of the period",
                            "periodStartLabel":  "Cash and cash equivalents at beginning of the period"
                            }
                        }
                    },
                "localname":  "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect":  {
                "auth_ref":  [
                    "r73",
                    "r331"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change.  Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.  Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
                            "label":  "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect",
                            "totalLabel":  "Net increase / (decrease) in cash and cash equivalents"
                            }
                        }
                    },
                "localname":  "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CommitmentsAndContingencies":  {
                "auth_ref":  [
                    "r42",
                    "r210",
                    "r383",
                    "r395"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LiabilitiesAndStockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.",
                            "label":  "Commitments and Contingencies",
                            "terseLabel":  "Commitments and contingencies"
                            }
                        }
                    },
                "localname":  "CommitmentsAndContingencies",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CommonStockMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Stock that is subordinate to all other stock of the issuer.",
                            "label":  "Common Stock [Member]",
                            "terseLabel":  "Common Stock"
                            }
                        }
                    },
                "localname":  "CommonStockMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_CommonStockParOrStatedValuePerShare":  {
                "auth_ref":  [
                    "r18"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Face amount or stated value per share of common stock.",
                            "label":  "Common Stock, Par or Stated Value Per Share",
                            "terseLabel":  "Common stock, par value (in dollars per share)"
                            }
                        }
                    },
                "localname":  "CommonStockParOrStatedValuePerShare",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_CommonStockSharesAuthorized":  {
                "auth_ref":  [
                    "r18"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The maximum number of common shares permitted to be issued by an entity's charter and bylaws.",
                            "label":  "Common Stock, Shares Authorized",
                            "terseLabel":  "Common stock, shares authorized (in shares)"
                            }
                        }
                    },
                "localname":  "CommonStockSharesAuthorized",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_CommonStockSharesIssued":  {
                "auth_ref":  [
                    "r18"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury).  These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized.  Shares issued include shares outstanding and shares held in the treasury.",
                            "label":  "Common Stock, Shares, Issued",
                            "terseLabel":  "Common stock, shares issued (in shares)"
                            }
                        }
                    },
                "localname":  "CommonStockSharesIssued",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_CommonStockSharesOutstanding":  {
                "auth_ref":  [
                    "r18",
                    "r224"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of shares of common stock outstanding.  Common stock represent the ownership interest in a corporation.",
                            "label":  "Common Stock, Shares, Outstanding",
                            "terseLabel":  "Common stock, shares outstanding (in shares)"
                            }
                        }
                    },
                "localname":  "CommonStockSharesOutstanding",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_CommonStockValue":  {
                "auth_ref":  [
                    "r18"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer).  This item includes treasury stock repurchased by the entity.  Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.",
                            "label":  "Common Stock, Value, Issued",
                            "terseLabel":  "Common stock, $0.01 par value, 300,000,000 shares authorized; 48,807,707 and 48,700,963 shares issued; and 48,660,454 and 48,700,713 shares outstanding as of March 31, 2020 and December 31, 2019, respectively."
                            }
                        }
                    },
                "localname":  "CommonStockValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ConcentrationRiskBenchmarkDomain":  {
                "auth_ref":  [
                    "r115",
                    "r116",
                    "r328",
                    "r329"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The denominator in a calculation of a disclosed concentration risk percentage.",
                            "label":  "Concentration Risk Benchmark [Domain]",
                            "terseLabel":  "Concentration Risk Benchmark [Domain]"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskBenchmarkDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails",
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ConcentrationRiskByBenchmarkAxis":  {
                "auth_ref":  [
                    "r115",
                    "r116",
                    "r328",
                    "r329",
                    "r403"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by benchmark of concentration risk.",
                            "label":  "Concentration Risk Benchmark [Axis]",
                            "terseLabel":  "Concentration Risk Benchmark [Axis]"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskByBenchmarkAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails",
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ConcentrationRiskByTypeAxis":  {
                "auth_ref":  [
                    "r115",
                    "r116",
                    "r328",
                    "r329",
                    "r403"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of concentration risk, for example, but not limited to, asset, liability, net assets, geographic, customer, employees, supplier, lender.",
                            "label":  "Concentration Risk Type [Axis]",
                            "terseLabel":  "Concentration Risk Type [Axis]"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskByTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails",
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ConcentrationRiskDisclosureTextBlock":  {
                "auth_ref":  [
                    "r121"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact.  This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.",
                            "label":  "Concentration Risk Disclosure [Text Block]",
                            "terseLabel":  "Significant Service Providers"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SignificantServiceProviders"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ConcentrationRiskLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Concentration Risk [Line Items]",
                            "terseLabel":  "Concentration Risk [Line Items]"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ConcentrationRiskPercentage1":  {
                "auth_ref":  [
                    "r115",
                    "r116",
                    "r328",
                    "r329"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the \"benchmark\" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.",
                            "label":  "Concentration Risk, Percentage",
                            "terseLabel":  "Concentration risk percentage",
                            "verboseLabel":  "Concentration risk percentage"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskPercentage1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails",
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_ConcentrationRiskTable":  {
                "auth_ref":  [
                    "r113",
                    "r115",
                    "r116",
                    "r117",
                    "r328",
                    "r330"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Describes the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.",
                            "label":  "Concentration Risk [Table]",
                            "terseLabel":  "Concentration Risk [Table]"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ConcentrationRiskTypeDomain":  {
                "auth_ref":  [
                    "r115",
                    "r116",
                    "r328",
                    "r329"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "For an entity that discloses a concentration risk as a percentage of some financial balance or benchmark, identifies the type (for example, asset, liability, net assets, geographic, customer, employees, supplier, lender) of the concentration.",
                            "label":  "Concentration Risk Type [Domain]",
                            "terseLabel":  "Concentration Risk Type [Domain]"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskTypeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails",
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock":  {
                "auth_ref":  [
                    "r236"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of contract balances and changes in contract balances.",
                            "label":  "Contract with Customer, Asset and Liability [Table Text Block]",
                            "terseLabel":  "Schedule of Contract Assets and Contract Liabilities"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerAssetAndLiabilityTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ContractWithCustomerAssetNet":  {
                "auth_ref":  [
                    "r233",
                    "r235",
                    "r239"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.",
                            "label":  "Contract with Customer, Asset, after Allowance for Credit Loss",
                            "periodEndLabel":  "End of period balance",
                            "periodStartLabel":  "Beginning of period balance"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerAssetNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersContractAssetAndLiabilityBalancesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ContractWithCustomerLiability":  {
                "auth_ref":  [
                    "r233",
                    "r234",
                    "r239"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.",
                            "label":  "Contract with Customer, Liability",
                            "periodEndLabel":  "End of period balance",
                            "periodStartLabel":  "Beginning of period balance",
                            "verboseLabel":  "Deferred revenue"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerLiability",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersContractAssetAndLiabilityBalancesDetails",
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ContractWithCustomerLiabilityCurrent":  {
                "auth_ref":  [
                    "r233",
                    "r234",
                    "r239"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_LiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.",
                            "label":  "Contract with Customer, Liability, Current",
                            "verboseLabel":  "Deferred revenue"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerLiabilityCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ContractWithCustomerLiabilityNoncurrent":  {
                "auth_ref":  [
                    "r233",
                    "r234",
                    "r239"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.",
                            "label":  "Contract with Customer, Liability, Noncurrent",
                            "terseLabel":  "Deferred revenue"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerLiabilityNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ContractWithCustomerLiabilityRevenueRecognized":  {
                "auth_ref":  [
                    "r240"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.",
                            "label":  "Contract with Customer, Liability, Revenue Recognized",
                            "negatedLabel":  "Revenue recognized from amounts included in contract liabilities"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerLiabilityRevenueRecognized",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersContractAssetAndLiabilityBalancesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CostOfGoodsAndServicesSold":  {
                "auth_ref":  [
                    "r61"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_OperatingIncomeLoss",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period.  This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.",
                            "label":  "Cost of Goods and Services Sold",
                            "verboseLabel":  "Total cost of revenue"
                            }
                        }
                    },
                "localname":  "CostOfGoodsAndServicesSold",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CostOfGoodsAndServicesSoldAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Cost of Goods and Services Sold [Abstract]",
                            "terseLabel":  "Cost of revenue:"
                            }
                        }
                    },
                "localname":  "CostOfGoodsAndServicesSoldAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_CostOfGoodsAndServicesSoldAmortization":  {
                "auth_ref":  [
                    "r59"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of expense for allocation of cost of intangible asset over its useful life directly used in production of good and rendering of service.",
                            "label":  "Cost, Amortization",
                            "terseLabel":  "Amortization on patents and tooling"
                            }
                        }
                    },
                "localname":  "CostOfGoodsAndServicesSoldAmortization",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CreditFacilityAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of credit facility.  Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.",
                            "label":  "Credit Facility [Axis]",
                            "terseLabel":  "Credit Facility [Axis]"
                            }
                        }
                    },
                "localname":  "CreditFacilityAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_CreditFacilityDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Type of credit facility.  Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.",
                            "label":  "Credit Facility [Domain]",
                            "terseLabel":  "Credit Facility [Domain]"
                            }
                        }
                    },
                "localname":  "CreditFacilityDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_CreditLossFinancialInstrumentPolicyTextBlock":  {
                "auth_ref":  [
                    "r158",
                    "r164",
                    "r169",
                    "r170",
                    "r178"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for credit loss on financial instrument measured at amortized cost basis, net investment in lease, off-balance sheet credit exposure, and available-for-sale debt security.  Includes, but is not limited to, methodology used to estimate allowance for credit loss, how writeoff of uncollectible amount is recognized, and determination of past due status and nonaccrual status.",
                            "label":  "Credit Loss, Financial Instrument [Policy Text Block]",
                            "terseLabel":  "Credit Losses"
                            }
                        }
                    },
                "localname":  "CreditLossFinancialInstrumentPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.",
                            "label":  "Cumulative Effect of New Accounting Principle in Period of Adoption",
                            "terseLabel":  "Adoption of accounting standard"
                            }
                        }
                    },
                "localname":  "CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CustomerConcentrationRiskMember":  {
                "auth_ref":  [
                    "r114"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Reflects the percentage that revenues in the period from one or more significant customers is to net revenues, as defined by the entity, such as total net revenues, product line revenues, segment revenues.  The risk is the materially adverse effects of loss of a significant customer.",
                            "label":  "Customer Concentration Risk [Member]",
                            "terseLabel":  "Service Provider Concentration Risk"
                            }
                        }
                    },
                "localname":  "CustomerConcentrationRiskMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_CustomerRelationshipsMember":  {
                "auth_ref":  [
                    "r294"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Customer relationship that exists between an entity and its customer, for example, but not limited to, tenant relationships.",
                            "label":  "Customer Relationships [Member]",
                            "terseLabel":  "Customer Relationships"
                            }
                        }
                    },
                "localname":  "CustomerRelationshipsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfNetCarryingAmountOfIntangibleAssetsDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_DebtInstrumentAxis":  {
                "auth_ref":  [
                    "r14",
                    "r15",
                    "r16",
                    "r377",
                    "r378",
                    "r390"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of debt instrument, including, but not limited to, draws against credit facilities.",
                            "label":  "Debt Instrument [Axis]",
                            "terseLabel":  "Debt Instrument [Axis]"
                            }
                        }
                    },
                "localname":  "DebtInstrumentAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DebtInstrumentBasisSpreadOnVariableRate1":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage points added to the reference rate to compute the variable rate on the debt instrument.",
                            "label":  "Debt Instrument, Basis Spread on Variable Rate",
                            "terseLabel":  "Basis spread on variable rate (percent)"
                            }
                        }
                    },
                "localname":  "DebtInstrumentBasisSpreadOnVariableRate1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_DebtInstrumentInterestRateStatedPercentage":  {
                "auth_ref":  [
                    "r39"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Contractual interest rate for funds borrowed, under the debt agreement.",
                            "label":  "Debt Instrument, Interest Rate, Stated Percentage",
                            "terseLabel":  "Debt instrument, interest rate"
                            }
                        }
                    },
                "localname":  "DebtInstrumentInterestRateStatedPercentage",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_DebtInstrumentLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Debt Instrument [Line Items]",
                            "terseLabel":  "Debt Instrument [Line Items]"
                            }
                        }
                    },
                "localname":  "DebtInstrumentLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DebtInstrumentNameDomain":  {
                "auth_ref":  [
                    "r40"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The name for the particular debt instrument or borrowing that distinguishes it from other debt instruments or borrowings, including draws against credit facilities.",
                            "label":  "Debt Instrument, Name [Domain]",
                            "terseLabel":  "Debt Instrument, Name [Domain]"
                            }
                        }
                    },
                "localname":  "DebtInstrumentNameDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_DebtInstrumentTable":  {
                "auth_ref":  [
                    "r40",
                    "r85",
                    "r225",
                    "r226",
                    "r227",
                    "r228",
                    "r332",
                    "r333",
                    "r335",
                    "r389"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A table or schedule providing information pertaining to long-term debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation.  These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.",
                            "label":  "Schedule of Long-term Debt Instruments [Table]",
                            "terseLabel":  "Schedule of Long-term Debt Instruments [Table]"
                            }
                        }
                    },
                "localname":  "DebtInstrumentTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]"
                            }
                        }
                    },
                "localname":  "DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DeferredIncomeTaxAssetsNet":  {
                "auth_ref":  [
                    "r278"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.",
                            "label":  "Deferred Income Tax Assets, Net",
                            "terseLabel":  "Deferred tax assets"
                            }
                        }
                    },
                "localname":  "DeferredIncomeTaxAssetsNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r76",
                    "r83",
                    "r281",
                    "r282"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  8.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.",
                            "label":  "Deferred Income Tax Expense (Benefit)",
                            "terseLabel":  "Deferred income taxes"
                            }
                        }
                    },
                "localname":  "DeferredIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredRevenueArrangementTypeAxis":  {
                "auth_ref":  [
                    "r10"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of deferred revenue arrangement.",
                            "label":  "Deferred Revenue Arrangement Type [Axis]",
                            "terseLabel":  "Deferred Revenue Arrangement Type [Axis]"
                            }
                        }
                    },
                "localname":  "DeferredRevenueArrangementTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DeferredRevenueArrangementTypeDomain":  {
                "auth_ref":  [
                    "r10"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Category of obligation arising when an entity receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized.",
                            "label":  "Deferred Revenue [Domain]",
                            "terseLabel":  "Deferred Revenue [Domain]"
                            }
                        }
                    },
                "localname":  "DeferredRevenueArrangementTypeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_DeferredTaxAssetsValuationAllowance":  {
                "auth_ref":  [
                    "r277"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.",
                            "label":  "Deferred Tax Assets, Valuation Allowance",
                            "terseLabel":  "Valuation allowance"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsValuationAllowance",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/IncomeTaxesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxLiabilities":  {
                "auth_ref":  [
                    "r270",
                    "r278"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  10.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.",
                            "label":  "Deferred Tax Liabilities, Net",
                            "negatedLabel":  "Deferred tax liability"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DepreciationAndAmortization":  {
                "auth_ref":  [
                    "r76",
                    "r203"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        },
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_OperatingExpenses",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.",
                            "label":  "Depreciation, Depletion and Amortization, Nonproduction",
                            "terseLabel":  "Amortization and depreciation",
                            "verboseLabel":  "Amortization and depreciation"
                            }
                        }
                    },
                "localname":  "DepreciationAndAmortization",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows",
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DevelopedTechnologyRightsMember":  {
                "auth_ref":  [
                    "r295"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Rights to developed technology, which can include the right to develop, use, market, sell, or offer for sale products, compounds, or intellectual property.",
                            "label":  "Developed Technology Rights [Member]",
                            "terseLabel":  "Developed Technology"
                            }
                        }
                    },
                "localname":  "DevelopedTechnologyRightsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfNetCarryingAmountOfIntangibleAssetsDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_DisaggregationOfRevenueLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Disaggregation of Revenue [Line Items]",
                            "terseLabel":  "Disaggregation of Revenue [Line Items]"
                            }
                        }
                    },
                "localname":  "DisaggregationOfRevenueLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DisaggregationOfRevenueTable":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.",
                            "label":  "Disaggregation of Revenue [Table]",
                            "terseLabel":  "Disaggregation of Revenue [Table]"
                            }
                        }
                    },
                "localname":  "DisaggregationOfRevenueTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomersNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock":  {
                "auth_ref":  [
                    "r266"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for share-based payment arrangement.",
                            "label":  "Share-based Payment Arrangement [Text Block]",
                            "terseLabel":  "Stock-Based Compensation"
                            }
                        }
                    },
                "localname":  "DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensation"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Share-based Payment Arrangement [Abstract]"
                            }
                        }
                    },
                "localname":  "DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_EarningsPerShareAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Earnings Per Share [Abstract]",
                            "terseLabel":  "Per share information attributable to common stockholders:"
                            }
                        }
                    },
                "localname":  "EarningsPerShareAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_EarningsPerShareBasic":  {
                "auth_ref":  [
                    "r55",
                    "r91",
                    "r96",
                    "r98",
                    "r99",
                    "r100",
                    "r103",
                    "r387",
                    "r398"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.",
                            "label":  "Earnings Per Share, Basic",
                            "verboseLabel":  "Basic (in dollars per share)"
                            }
                        }
                    },
                "localname":  "EarningsPerShareBasic",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_EarningsPerShareBasicAndDilutedAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Earnings Per Share, Basic and Diluted [Abstract]",
                            "terseLabel":  "Weighted average common shares outstanding \u2014 diluted (C)",
                            "verboseLabel":  "Net income per share:"
                            }
                        }
                    },
                "localname":  "EarningsPerShareBasicAndDilutedAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_EarningsPerShareDiluted":  {
                "auth_ref":  [
                    "r55",
                    "r91",
                    "r96",
                    "r98",
                    "r99",
                    "r100",
                    "r103",
                    "r387",
                    "r398"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.",
                            "label":  "Earnings Per Share, Diluted",
                            "verboseLabel":  "Diluted (in dollars per share)"
                            }
                        }
                    },
                "localname":  "EarningsPerShareDiluted",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_EarningsPerShareTextBlock":  {
                "auth_ref":  [
                    "r104"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for earnings per share.",
                            "label":  "Earnings Per Share [Text Block]",
                            "terseLabel":  "Earnings Per Share"
                            }
                        }
                    },
                "localname":  "EarningsPerShareTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/EarningsPerShare"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_EffectiveIncomeTaxRateContinuingOperations":  {
                "auth_ref":  [
                    "r87",
                    "r271",
                    "r272"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.",
                            "label":  "Effective Income Tax Rate Reconciliation, Percent",
                            "terseLabel":  "Effective income tax rate (percent)"
                            }
                        }
                    },
                "localname":  "EffectiveIncomeTaxRateContinuingOperations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/IncomeTaxesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_EmployeeRelatedLiabilitiesCurrent":  {
                "auth_ref":  [
                    "r37"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits.  Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
                            "label":  "Employee-related Liabilities, Current",
                            "terseLabel":  "Accrued compensation"
                            }
                        }
                    },
                "localname":  "EmployeeRelatedLiabilitiesCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]",
                            "terseLabel":  "Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]"
                            }
                        }
                    },
                "localname":  "EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense":  {
                "auth_ref":  [
                    "r260"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of tax benefit for recognition of expense of award under share-based payment arrangement.",
                            "label":  "Share-based Payment Arrangement, Expense, Tax Benefit",
                            "terseLabel":  "Tax benefit from stock-based awards"
                            }
                        }
                    },
                "localname":  "EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EmployeeStockOptionMember":  {
                "auth_ref":  [
                    "r258"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Share-based payment arrangement granting right, subject to vesting and other restrictions, to purchase or sell certain number of shares at predetermined price for specified period of time.",
                            "label":  "Share-based Payment Arrangement, Option [Member]",
                            "terseLabel":  "Stock options",
                            "verboseLabel":  "Stock options and assumed options"
                            }
                        }
                    },
                "localname":  "EmployeeStockOptionMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails",
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails",
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_EquityAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Equity [Abstract]"
                            }
                        }
                    },
                "localname":  "EquityAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_EquityComponentDomain":  {
                "auth_ref":  [
                    "r224"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Components of equity are the parts of the total Equity balance including that which is allocated to common, preferred, treasury stock, retained earnings, etc.",
                            "label":  "Equity Component [Domain]",
                            "terseLabel":  "Equity Component [Domain]"
                            }
                        }
                    },
                "localname":  "EquityComponentDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_EquityMethodInvesteeMember":  {
                "auth_ref":  [
                    "r154",
                    "r364",
                    "r366",
                    "r368",
                    "r370",
                    "r372",
                    "r374"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "An entity that issued voting stock held by an investor and that is accounted for under the equity method of accounting by the investor.",
                            "label":  "Equity Method Investee [Member]",
                            "terseLabel":  "Equity Method Investee"
                            }
                        }
                    },
                "localname":  "EquityMethodInvesteeMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_EquityMethodInvestmentOwnershipPercentage":  {
                "auth_ref":  [
                    "r156"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.",
                            "label":  "Equity Method Investment, Ownership Percentage",
                            "terseLabel":  "Ownership percentage in equity method investment"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestmentOwnershipPercentage",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_EquityMethodInvestments":  {
                "auth_ref":  [
                    "r32",
                    "r132",
                    "r155"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee.  This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.",
                            "label":  "Equity Method Investments",
                            "terseLabel":  "Equity investment in installation partner"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]",
                            "terseLabel":  "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"
                            }
                        }
                    },
                "localname":  "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable":  {
                "auth_ref":  [
                    "r315",
                    "r316",
                    "r317",
                    "r324"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about asset and liability measured at fair value on recurring and nonrecurring basis.",
                            "label":  "Fair Value, Recurring and Nonrecurring [Table]",
                            "terseLabel":  "Fair Value, Recurring and Nonrecurring [Table]"
                            }
                        }
                    },
                "localname":  "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]",
                            "terseLabel":  "Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]"
                            }
                        }
                    },
                "localname":  "FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueByBalanceSheetGroupingTable":  {
                "auth_ref":  [
                    "r315",
                    "r326",
                    "r327"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.",
                            "label":  "Fair Value, by Balance Sheet Grouping [Table]",
                            "terseLabel":  "Fair Value, by Balance Sheet Grouping [Table]"
                            }
                        }
                    },
                "localname":  "FairValueByBalanceSheetGroupingTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueByFairValueHierarchyLevelAxis":  {
                "auth_ref":  [
                    "r244",
                    "r245",
                    "r247",
                    "r316",
                    "r358"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by level within fair value hierarchy and fair value measured at net asset value per share as practical expedient.",
                            "label":  "Fair Value Hierarchy and NAV [Axis]",
                            "terseLabel":  "Fair Value Hierarchy and NAV [Axis]"
                            }
                        }
                    },
                "localname":  "FairValueByFairValueHierarchyLevelAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueByLiabilityClassAxis":  {
                "auth_ref":  [
                    "r323",
                    "r324"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by class of liability.",
                            "label":  "Liability Class [Axis]",
                            "terseLabel":  "Liability Class [Axis]"
                            }
                        }
                    },
                "localname":  "FairValueByLiabilityClassAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsSummaryOfFairValueOfLevel3SubsidiaryUnitAwardsAndContingentConsiderationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueByMeasurementFrequencyAxis":  {
                "auth_ref":  [
                    "r315",
                    "r316",
                    "r319",
                    "r320",
                    "r325"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by measurement frequency.",
                            "label":  "Measurement Frequency [Axis]",
                            "terseLabel":  "Measurement Frequency [Axis]"
                            }
                        }
                    },
                "localname":  "FairValueByMeasurementFrequencyAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueDisclosuresAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Fair Value Disclosures [Abstract]"
                            }
                        }
                    },
                "localname":  "FairValueDisclosuresAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueDisclosuresTextBlock":  {
                "auth_ref":  [
                    "r323"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities.  Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.",
                            "label":  "Fair Value Disclosures [Text Block]",
                            "terseLabel":  "Fair Value Measurements"
                            }
                        }
                    },
                "localname":  "FairValueDisclosuresTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurements"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_FairValueInputsLevel1Member":  {
                "auth_ref":  [
                    "r244",
                    "r245",
                    "r247",
                    "r316",
                    "r359"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Quoted prices in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.",
                            "label":  "Fair Value, Inputs, Level 1 [Member]",
                            "terseLabel":  "Level 1"
                            }
                        }
                    },
                "localname":  "FairValueInputsLevel1Member",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FairValueInputsLevel2Member":  {
                "auth_ref":  [
                    "r244",
                    "r245",
                    "r247",
                    "r316",
                    "r360"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Inputs other than quoted prices included within level 1 that are observable for an asset or liability, either directly or indirectly, including, but not limited to, quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in inactive markets.",
                            "label":  "Fair Value, Inputs, Level 2 [Member]",
                            "terseLabel":  "Level 2"
                            }
                        }
                    },
                "localname":  "FairValueInputsLevel2Member",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FairValueInputsLevel3Member":  {
                "auth_ref":  [
                    "r244",
                    "r245",
                    "r247",
                    "r316",
                    "r361"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.",
                            "label":  "Fair Value, Inputs, Level 3 [Member]",
                            "terseLabel":  "Level 3"
                            }
                        }
                    },
                "localname":  "FairValueInputsLevel3Member",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain":  {
                "auth_ref":  [
                    "r321"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents classes of liabilities measured and disclosed at fair value.",
                            "label":  "Fair Value by Liability Class [Domain]",
                            "terseLabel":  "Fair Value by Liability Class [Domain]"
                            }
                        }
                    },
                "localname":  "FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsSummaryOfFairValueOfLevel3SubsidiaryUnitAwardsAndContingentConsiderationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]",
                            "terseLabel":  "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]"
                            }
                        }
                    },
                "localname":  "FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsSummaryOfFairValueOfLevel3SubsidiaryUnitAwardsAndContingentConsiderationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]",
                            "terseLabel":  "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]"
                            }
                        }
                    },
                "localname":  "FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsSummaryOfFairValueOfLevel3SubsidiaryUnitAwardsAndContingentConsiderationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable":  {
                "auth_ref":  [
                    "r321",
                    "r324"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule of information required and determined to be provided for purposes of reconciling beginning and ending balances of fair value measurements of liabilities using significant unobservable inputs (level 3).  Separately presenting changes during the period, attributable to: (1) total gains or losses for the period (realized and unrealized) and location reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (net); (3) transfers in and/or out of Level 3.",
                            "label":  "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]",
                            "terseLabel":  "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]"
                            }
                        }
                    },
                "localname":  "FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsSummaryOfFairValueOfLevel3SubsidiaryUnitAwardsAndContingentConsiderationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock":  {
                "auth_ref":  [
                    "r321",
                    "r324"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.",
                            "label":  "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]",
                            "terseLabel":  "Summary of Fair Value of Level 3 Liability"
                            }
                        }
                    },
                "localname":  "FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_FairValueMeasurementFrequencyDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Measurement frequency.",
                            "label":  "Measurement Frequency [Domain]",
                            "terseLabel":  "Measurement Frequency [Domain]"
                            }
                        }
                    },
                "localname":  "FairValueMeasurementFrequencyDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings":  {
                "auth_ref":  [
                    "r322"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).",
                            "label":  "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings",
                            "negatedTerseLabel":  "Changes in fair value included in earnings"
                            }
                        }
                    },
                "localname":  "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsSummaryOfFairValueOfLevel3SubsidiaryUnitAwardsAndContingentConsiderationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue":  {
                "auth_ref":  [
                    "r321"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.",
                            "label":  "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value",
                            "periodEndLabel":  "End of period balance",
                            "periodStartLabel":  "Beginning of period balance"
                            }
                        }
                    },
                "localname":  "FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsSummaryOfFairValueOfLevel3SubsidiaryUnitAwardsAndContingentConsiderationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FairValueMeasurementsFairValueHierarchyDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Categories used to prioritize the inputs to valuation techniques to measure fair value.",
                            "label":  "Fair Value Hierarchy and NAV [Domain]",
                            "terseLabel":  "Fair Value Hierarchy and NAV [Domain]"
                            }
                        }
                    },
                "localname":  "FairValueMeasurementsFairValueHierarchyDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FairValueMeasurementsRecurringMember":  {
                "auth_ref":  [
                    "r323",
                    "r325"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Frequent fair value measurement.  Includes, but is not limited to, fair value adjustment for impairment of asset, liability or equity, frequently measured at fair value.",
                            "label":  "Fair Value, Recurring [Member]",
                            "terseLabel":  "Fair Value, Measurements, Recurring"
                            }
                        }
                    },
                "localname":  "FairValueMeasurementsRecurringMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails",
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FederalFundsEffectiveSwapRateMember":  {
                "auth_ref":  [
                    "r314"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fixed rate on U.S. dollar, constant-notional interest rate swap having its variable-rate leg referenced to Federal Funds effective rate with no additional spread over Federal Funds effective rate on that variable-rate leg.",
                            "label":  "Fed Funds Effective Rate Overnight Index Swap Rate [Member]",
                            "terseLabel":  "Federal Funds Rate"
                            }
                        }
                    },
                "localname":  "FederalFundsEffectiveSwapRateMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FinanceLeaseLiability":  {
                "auth_ref":  [
                    "r337",
                    "r347"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Present value of lessee's discounted obligation for lease payments from finance lease.",
                            "label":  "Finance Lease, Liability",
                            "terseLabel":  "Finance leases"
                            }
                        }
                    },
                "localname":  "FinanceLeaseLiability",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinanceReceivablesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amounts due the Company from customers, clients, lessees, borrowers, or others under the terms of its agreements therewith.  Such amount may include accrued interest receivable in accordance with the terms of the agreements.  The agreements also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.",
                            "label":  "Financing Receivable [Member]",
                            "terseLabel":  "Hardware Financing Receivables"
                            }
                        }
                    },
                "localname":  "FinanceReceivablesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAmortizedCostDetails",
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails",
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FinancingReceivableAllowanceForCreditLosses":  {
                "auth_ref":  [
                    "r142",
                    "r157",
                    "r159",
                    "r162",
                    "r380"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of allowance for credit loss on financing receivable.  Excludes allowance for financing receivable covered under loss sharing agreement.",
                            "label":  "Financing Receivable, Allowance for Credit Loss",
                            "negatedPeriodEndLabel":  "End of period balance, subsequent to adoption of Topic 326",
                            "negatedPeriodStartLabel":  "Beginning of period balance, prior to adoption of Topic 326"
                            }
                        }
                    },
                "localname":  "FinancingReceivableAllowanceForCreditLosses",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Financing Receivable, Allowance for Credit Loss [Line Items]",
                            "terseLabel":  "Financing Receivable, Allowance for Credit Loss [Line Items]"
                            }
                        }
                    },
                "localname":  "FinancingReceivableAllowanceForCreditLossesLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAmortizedCostDetails",
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Financing Receivable, Allowance for Credit Loss [Roll Forward]",
                            "terseLabel":  "Financing Receivable, Allowance for Credit Loss [Roll Forward]"
                            }
                        }
                    },
                "localname":  "FinancingReceivableAllowanceForCreditLossesRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs":  {
                "auth_ref":  [
                    "r143",
                    "r161",
                    "r176",
                    "r380"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of writeoff of financing receivable, charged against allowance for credit loss.",
                            "label":  "Financing Receivable, Allowance for Credit Loss, Writeoff",
                            "terseLabel":  "Write-offs"
                            }
                        }
                    },
                "localname":  "FinancingReceivableAllowanceForCreditLossesWriteOffs",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock":  {
                "auth_ref":  [
                    "r145",
                    "r172"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of financing receivables by credit quality indicator.  The credit quality indicator is a statistic about the credit quality of financing receivables.  Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics.",
                            "label":  "Financing Receivable Credit Quality Indicators [Table Text Block]",
                            "terseLabel":  "Financing Receivable Credit Quality Indicators [Table Text Block]"
                            }
                        }
                    },
                "localname":  "FinancingReceivableCreditQualityIndicatorsTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsOtherAssetsTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_FinancingReceivableNonaccrualInterestIncome":  {
                "auth_ref":  [
                    "r165"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of interest income on financing receivable on nonaccrual status.",
                            "label":  "Financing Receivable, Nonaccrual, Interest Income",
                            "terseLabel":  "Interest income recognized for notes receivables in nonaccrual status"
                            }
                        }
                    },
                "localname":  "FinancingReceivableNonaccrualInterestIncome",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAllowanceForCreditLossesNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinancingReceivableNonaccrualNoAllowance":  {
                "auth_ref":  [
                    "r167"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of financing receivable on nonaccrual status with no allowance for credit loss.",
                            "label":  "Financing Receivable, Nonaccrual, No Allowance",
                            "terseLabel":  "Nonaccrual notes receivable without related allowance for credit loss"
                            }
                        }
                    },
                "localname":  "FinancingReceivableNonaccrualNoAllowance",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAllowanceForCreditLossesNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinancingReceivableNonaccrualStatusLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Financing Receivable, Nonaccrual [Line Items]",
                            "terseLabel":  "Financing Receivable, Nonaccrual [Line Items]"
                            }
                        }
                    },
                "localname":  "FinancingReceivableNonaccrualStatusLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAllowanceForCreditLossesNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FinancingReceivableNonaccrualTable":  {
                "auth_ref":  [
                    "r168"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about financing receivable on nonaccrual status.",
                            "label":  "Financing Receivable, Nonaccrual [Table]",
                            "terseLabel":  "Financing Receivable, Nonaccrual [Table]"
                            }
                        }
                    },
                "localname":  "FinancingReceivableNonaccrualTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAllowanceForCreditLossesNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear":  {
                "auth_ref":  [
                    "r173",
                    "r176"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_NotesReceivableGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of financing receivable originated five or more years prior to latest fiscal year.",
                            "label":  "Financing Receivable, Originated Five or More Years before Latest Fiscal Year",
                            "terseLabel":  "Prior"
                            }
                        }
                    },
                "localname":  "FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear":  {
                "auth_ref":  [
                    "r173",
                    "r176"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_NotesReceivableGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of financing receivable originated four years prior to latest fiscal year.",
                            "label":  "Financing Receivable, Originated Four Years before Latest Fiscal Year",
                            "terseLabel":  "2016"
                            }
                        }
                    },
                "localname":  "FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear":  {
                "auth_ref":  [
                    "r173",
                    "r176"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NotesReceivableGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of financing receivable originated in current fiscal year.",
                            "label":  "Financing Receivable, Originated in Current Fiscal Year",
                            "terseLabel":  "2020"
                            }
                        }
                    },
                "localname":  "FinancingReceivableOriginatedInCurrentFiscalYear",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear":  {
                "auth_ref":  [
                    "r173",
                    "r176"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NotesReceivableGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of financing receivable originated in fiscal year prior to latest fiscal year.",
                            "label":  "Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year",
                            "terseLabel":  "2019"
                            }
                        }
                    },
                "localname":  "FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear":  {
                "auth_ref":  [
                    "r173",
                    "r176"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_NotesReceivableGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of financing receivable originated three years prior to latest fiscal year.",
                            "label":  "Financing Receivable, Originated Three Years before Latest Fiscal Year",
                            "terseLabel":  "2017"
                            }
                        }
                    },
                "localname":  "FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear":  {
                "auth_ref":  [
                    "r173",
                    "r176"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NotesReceivableGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of financing receivable originated two years prior to latest fiscal year.",
                            "label":  "Financing Receivable, Originated Two Years before Latest Fiscal Year",
                            "terseLabel":  "2018"
                            }
                        }
                    },
                "localname":  "FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing":  {
                "auth_ref":  [
                    "r148",
                    "r166",
                    "r177"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of financing receivable 90 days or more past due and still accruing.",
                            "label":  "Financing Receivable, 90 Days or More Past Due, Still Accruing",
                            "terseLabel":  "Notes receivable 90 days or more past due still accruing"
                            }
                        }
                    },
                "localname":  "FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAllowanceForCreditLossesNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis":  {
                "auth_ref":  [
                    "r146",
                    "r149",
                    "r150",
                    "r164",
                    "r168",
                    "r172",
                    "r174",
                    "r175",
                    "r176",
                    "r177"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by class of financing receivable determined on the basis of initial measurement attribute, risk characteristics and method of monitoring and assessing credit risk.",
                            "label":  "Class of Financing Receivable [Axis]",
                            "terseLabel":  "Class of Financing Receivable [Axis]"
                            }
                        }
                    },
                "localname":  "FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Financing receivables determined on the basis of initial measurement attribute, risk characteristics and method of monitoring and assessing credit risk.",
                            "label":  "Class of Financing Receivable [Domain]",
                            "terseLabel":  "Class of Financing Receivable [Domain]"
                            }
                        }
                    },
                "localname":  "FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FinancingReceivables1To29DaysPastDueMember":  {
                "auth_ref":  [
                    "r177"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Financial asset fewer than 30 days past due.",
                            "label":  "Financial Asset, 1 to 29 Days Past Due [Member]",
                            "terseLabel":  "Current"
                            }
                        }
                    },
                "localname":  "FinancingReceivables1To29DaysPastDueMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FinancingReceivables30To59DaysPastDueMember":  {
                "auth_ref":  [
                    "r177"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Financial asset more than 29 days past due but fewer than 60 days past due.",
                            "label":  "Financial Asset, 30 to 59 Days Past Due [Member]",
                            "terseLabel":  "30-59 days past due"
                            }
                        }
                    },
                "localname":  "FinancingReceivables30To59DaysPastDueMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FinancingReceivables60To89DaysPastDueMember":  {
                "auth_ref":  [
                    "r177"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Financial asset more than 59 days past due but fewer than 90 days past due.",
                            "label":  "Financial Asset, 60 to 89 Days Past Due [Member]",
                            "terseLabel":  "60-89 days past due"
                            }
                        }
                    },
                "localname":  "FinancingReceivables60To89DaysPastDueMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FinancingReceivablesPeriodPastDueAxis":  {
                "auth_ref":  [
                    "r164",
                    "r177"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by time period financial asset is past due.",
                            "label":  "Financial Asset, Period Past Due [Axis]",
                            "terseLabel":  "Financial Asset, Period Past Due [Axis]"
                            }
                        }
                    },
                "localname":  "FinancingReceivablesPeriodPastDueAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FinancingReceivablesPeriodPastDueDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Period in which financial asset is past due.  Element name and standard label in Financial Asset, [numeric lower end] to [numeric higher end] [date measure] Past Due [Member] or Financial Asset, Greater Than [low end numeric value] [date measure] Past Due [Member] or Financial Asset, Less Than [high end numeric value] [date measure] Past Due [Member] formats.",
                            "label":  "Financial Asset, Period Past Due [Domain]",
                            "terseLabel":  "Financial Asset, Period Past Due [Domain]"
                            }
                        }
                    },
                "localname":  "FinancingReceivablesPeriodPastDueDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetUsefulLife":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
                            "label":  "Finite-Lived Intangible Asset, Useful Life",
                            "terseLabel":  "Finite-lived intangible asset, useful life"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetUsefulLife",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization":  {
                "auth_ref":  [
                    "r198"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_FiniteLivedIntangibleAssetsNet",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.",
                            "label":  "Finite-Lived Intangible Assets, Accumulated Amortization",
                            "negatedTerseLabel":  "Accumulated Amortization"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAccumulatedAmortization",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis":  {
                "auth_ref":  [
                    "r193",
                    "r196",
                    "r198",
                    "r200",
                    "r362"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by major type or class of finite-lived intangible assets.",
                            "label":  "Finite-Lived Intangible Assets by Major Class [Axis]",
                            "terseLabel":  "Finite-Lived Intangible Assets by Major Class [Axis]"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsByMajorClassAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfNetCarryingAmountOfIntangibleAssetsDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsGross":  {
                "auth_ref":  [
                    "r198",
                    "r362"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_FiniteLivedIntangibleAssetsNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.",
                            "label":  "Finite-Lived Intangible Assets, Gross",
                            "terseLabel":  "Gross Carrying Amount",
                            "verboseLabel":  "Finite-lived intangible assets, gross"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Finite-Lived Intangible Assets [Line Items]",
                            "terseLabel":  "Finite-Lived Intangible Assets [Line Items]"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfNetCarryingAmountOfIntangibleAssetsDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain":  {
                "auth_ref":  [
                    "r193",
                    "r197"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The major class of finite-lived intangible asset (for example, patents, trademarks, copyrights, etc.) A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.",
                            "label":  "Finite-Lived Intangible Assets, Major Class Name [Domain]",
                            "terseLabel":  "Finite-Lived Intangible Assets, Major Class Name [Domain]"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsMajorClassNameDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfNetCarryingAmountOfIntangibleAssetsDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsNet":  {
                "auth_ref":  [
                    "r198"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        },
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.",
                            "label":  "Finite-Lived Intangible Assets, Net",
                            "periodEndLabel":  "Ending balance",
                            "periodStartLabel":  "Beginning balance",
                            "terseLabel":  "Finite-lived, intangible assets, net",
                            "totalLabel":  "Net Carrying Value",
                            "verboseLabel":  "Intangible assets, net"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfNetCarryingAmountOfIntangibleAssetsDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
                            "label":  "Finite-Lived Intangible Assets, Remaining Amortization Period",
                            "terseLabel":  "Weighted- Average Remaining Life"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Finite-lived Intangible Assets [Roll Forward]",
                            "terseLabel":  "Finite-lived Intangible Assets [Roll Forward]"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfNetCarryingAmountOfIntangibleAssetsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FinitelivedIntangibleAssetsAcquired1":  {
                "auth_ref":  [
                    "r194"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.",
                            "label":  "Finite-lived Intangible Assets Acquired",
                            "terseLabel":  "Assets acquired"
                            }
                        }
                    },
                "localname":  "FinitelivedIntangibleAssetsAcquired1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_GainLossOnSaleOfOtherLoansAndLeases":  {
                "auth_ref":  [
                    "r76"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of other loans and leases that were sold during the reporting period; excludes gains (losses) on sales of consumer and mortgage loans.  This element refers to the gain (loss) and not to the cash proceeds of the sales.  This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.",
                            "label":  "Gain (Loss) on Sale of Other Loans and Leases",
                            "terseLabel":  "Gain recorded within other income, net"
                            }
                        }
                    },
                "localname":  "GainLossOnSaleOfOtherLoansAndLeases",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_GeneralAndAdministrativeExpense":  {
                "auth_ref":  [
                    "r62"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_OperatingExpenses",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.",
                            "label":  "General and Administrative Expense",
                            "terseLabel":  "General and administrative"
                            }
                        }
                    },
                "localname":  "GeneralAndAdministrativeExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_GeneralAndAdministrativeExpenseMember":  {
                "auth_ref":  [
                    "r56"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Primary financial statement caption encompassing general and administrative expense.",
                            "label":  "General and Administrative Expense [Member]",
                            "terseLabel":  "General and administrative"
                            }
                        }
                    },
                "localname":  "GeneralAndAdministrativeExpenseMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_Goodwill":  {
                "auth_ref":  [
                    "r184",
                    "r186"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails":  {
                        "order":  13.0,
                        "parentTag":  "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
                        "weight":  1.0
                        },
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.",
                            "label":  "Goodwill",
                            "periodEndLabel":  "Ending balance",
                            "periodStartLabel":  "Beginning balance",
                            "terseLabel":  "Goodwill",
                            "verboseLabel":  "Goodwill"
                            }
                        }
                    },
                "localname":  "Goodwill",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfGoodwillDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_GoodwillAcquiredDuringPeriod":  {
                "auth_ref":  [
                    "r187"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.",
                            "label":  "Goodwill, Acquired During Period",
                            "terseLabel":  "Goodwill acquired"
                            }
                        }
                    },
                "localname":  "GoodwillAcquiredDuringPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfGoodwillDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Goodwill and Intangible Assets Disclosure [Abstract]"
                            }
                        }
                    },
                "localname":  "GoodwillAndIntangibleAssetsDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock":  {
                "auth_ref":  [
                    "r201"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for goodwill and intangible assets.",
                            "label":  "Goodwill and Intangible Assets Disclosure [Text Block]",
                            "terseLabel":  "Goodwill and Intangible Assets, Net"
                            }
                        }
                    },
                "localname":  "GoodwillAndIntangibleAssetsDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNet"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_GoodwillImpairmentLoss":  {
                "auth_ref":  [
                    "r76",
                    "r185",
                    "r188",
                    "r190"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.",
                            "label":  "Goodwill, Impairment Loss",
                            "terseLabel":  "Goodwill impairment"
                            }
                        }
                    },
                "localname":  "GoodwillImpairmentLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_GoodwillLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Goodwill [Line Items]",
                            "terseLabel":  "Goodwill [Line Items]"
                            }
                        }
                    },
                "localname":  "GoodwillLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfGoodwillDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_GoodwillRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Goodwill [Roll Forward]",
                            "terseLabel":  "Goodwill [Roll Forward]"
                            }
                        }
                    },
                "localname":  "GoodwillRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfGoodwillDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ImpairmentOfInvestments":  {
                "auth_ref":  [
                    "r153"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.",
                            "label":  "Other than Temporary Impairment Losses, Investments",
                            "terseLabel":  "Other-than-temporary impairments"
                            }
                        }
                    },
                "localname":  "ImpairmentOfInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ImpairmentOfLongLivedAssetsHeldForUse":  {
                "auth_ref":  [
                    "r76",
                    "r202",
                    "r205",
                    "r405"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).",
                            "label":  "Impairment of Long-Lived Assets Held-for-use",
                            "terseLabel":  "Impairment of long-lived assets"
                            }
                        }
                    },
                "localname":  "ImpairmentOfLongLivedAssetsHeldForUse",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest":  {
                "auth_ref":  [
                    "r53",
                    "r91",
                    "r375",
                    "r385",
                    "r399"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_ProfitLoss",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.",
                            "label":  "Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest",
                            "totalLabel":  "Income before income taxes"
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeStatementAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Income Statement [Abstract]"
                            }
                        }
                    },
                "localname":  "IncomeStatementAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncomeStatementLocationAxis":  {
                "auth_ref":  [
                    "r206"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by location in the income statement.",
                            "label":  "Income Statement Location [Axis]",
                            "terseLabel":  "Income Statement Location [Axis]"
                            }
                        }
                    },
                "localname":  "IncomeStatementLocationAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetNarrativeDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails",
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails",
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncomeStatementLocationDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Location in the income statement.",
                            "label":  "Income Statement Location [Domain]",
                            "terseLabel":  "Income Statement Location [Domain]"
                            }
                        }
                    },
                "localname":  "IncomeStatementLocationDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetNarrativeDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails",
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails",
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_IncomeTaxDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Income Tax Disclosure [Abstract]"
                            }
                        }
                    },
                "localname":  "IncomeTaxDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncomeTaxDisclosureTextBlock":  {
                "auth_ref":  [
                    "r285"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for income taxes.  Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.",
                            "label":  "Income Tax Disclosure [Text Block]",
                            "terseLabel":  "Income Taxes"
                            }
                        }
                    },
                "localname":  "IncomeTaxDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/IncomeTaxes"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_IncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r83",
                    "r130",
                    "r283"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_ProfitLoss",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.",
                            "label":  "Income Tax Expense (Benefit)",
                            "terseLabel":  "Provision (benefit) for income taxes",
                            "verboseLabel":  "Provision for income taxes"
                            }
                        }
                    },
                "localname":  "IncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/IncomeTaxesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxPolicyTextBlock":  {
                "auth_ref":  [
                    "r52",
                    "r80",
                    "r268",
                    "r269",
                    "r275",
                    "r276",
                    "r279",
                    "r284",
                    "r404"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.",
                            "label":  "Income Tax, Policy [Policy Text Block]",
                            "terseLabel":  "Income Taxes"
                            }
                        }
                    },
                "localname":  "IncomeTaxPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_IncreaseDecreaseInAccountsReceivable":  {
                "auth_ref":  [
                    "r75"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  12.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.",
                            "label":  "Increase (Decrease) in Accounts Receivable",
                            "negatedTerseLabel":  "Accounts receivable"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInAccountsReceivable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInContractWithCustomerLiability":  {
                "auth_ref":  [
                    "r75"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  16.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.",
                            "label":  "Increase (Decrease) in Contract with Customer, Liability",
                            "terseLabel":  "Deferred revenue"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInContractWithCustomerLiability",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInInventories":  {
                "auth_ref":  [
                    "r75"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  13.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.",
                            "label":  "Increase (Decrease) in Inventories",
                            "negatedTerseLabel":  "Inventory"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInInventories",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Increase (Decrease) in Operating Capital [Abstract]",
                            "terseLabel":  "Changes in operating assets and liabilities:"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInOperatingCapitalAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  18.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in noncurrent operating liabilities classified as other.",
                            "label":  "Increase (Decrease) in Other Noncurrent Liabilities",
                            "terseLabel":  "Other liabilities"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInOtherNoncurrentLiabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInOtherOperatingAssets":  {
                "auth_ref":  [
                    "r75"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  14.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in operating assets classified as other.",
                            "label":  "Increase (Decrease) in Other Operating Assets",
                            "negatedTerseLabel":  "Other current and non-current assets"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInOtherOperatingAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInStockholdersEquityRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Increase (Decrease) in Stockholders' Equity [Roll Forward]",
                            "terseLabel":  "Increase (Decrease) in Stockholders' Equity [Roll Forward]"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInStockholdersEquityRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncreaseDecreaseInTemporaryEquityRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Increase (Decrease) in Temporary Equity [Roll Forward]",
                            "terseLabel":  "Increase (Decrease) in Temporary Equity [Roll Forward]"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInTemporaryEquityRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements":  {
                "auth_ref":  [
                    "r97",
                    "r102"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
                        "weight":  1.0
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.",
                            "label":  "Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements",
                            "terseLabel":  "Dilutive effect of stock options and restricted stock units (in shares)"
                            }
                        }
                    },
                "localname":  "IncrementalCommonSharesAttributableToShareBasedPaymentArrangements",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_InterestExpenseLongTermDebt":  {
                "auth_ref":  [
                    "r388"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Aggregate amount of interest paid or due on all long-term debt.",
                            "label":  "Interest Expense, Long-term Debt",
                            "negatedTerseLabel":  "Interest expense"
                            }
                        }
                    },
                "localname":  "InterestExpenseLongTermDebt",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_InterestIncomeOther":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of interest income earned from interest bearing assets classified as other.",
                            "label":  "Interest Income, Other",
                            "terseLabel":  "Interest income"
                            }
                        }
                    },
                "localname":  "InterestIncomeOther",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_InterestReceivable":  {
                "auth_ref":  [
                    "r48"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying amount as of the balance sheet date of interest earned but not received.  Also called accrued interest or accrued interest receivable.",
                            "label":  "Interest Receivable",
                            "terseLabel":  "Interest receivable"
                            }
                        }
                    },
                "localname":  "InterestReceivable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IntersegmentEliminationMember":  {
                "auth_ref":  [
                    "r134"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Eliminating entries used in operating segment consolidation.",
                            "label":  "Intersegment Eliminations [Member]",
                            "terseLabel":  "Intersegment Eliminations"
                            }
                        }
                    },
                "localname":  "IntersegmentEliminationMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_InventoryDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Inventory Disclosure [Abstract]"
                            }
                        }
                    },
                "localname":  "InventoryDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_InventoryDisclosureTextBlock":  {
                "auth_ref":  [
                    "r181"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for inventory.  Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.",
                            "label":  "Inventory Disclosure [Text Block]",
                            "terseLabel":  "Inventory, Net"
                            }
                        }
                    },
                "localname":  "InventoryDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/InventoryNet"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_InventoryFinishedGoodsNetOfReserves":  {
                "auth_ref":  [
                    "r26",
                    "r180"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/InventoryNetDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_InventoryNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.",
                            "label":  "Inventory, Finished Goods, Net of Reserves",
                            "terseLabel":  "Finished goods"
                            }
                        }
                    },
                "localname":  "InventoryFinishedGoodsNetOfReserves",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/InventoryNetDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_InventoryNet":  {
                "auth_ref":  [
                    "r3",
                    "r47",
                    "r179"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_AssetsCurrent",
                        "weight":  1.0
                        },
                    "http://www.alarm.com/role/InventoryNetDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.",
                            "label":  "Inventory, Net",
                            "terseLabel":  "Inventory, net",
                            "totalLabel":  "Total inventory, net"
                            }
                        }
                    },
                "localname":  "InventoryNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets",
                    "http://www.alarm.com/role/InventoryNetDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_InventoryRawMaterialsNetOfReserves":  {
                "auth_ref":  [
                    "r27",
                    "r180"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/InventoryNetDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_InventoryNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.",
                            "label":  "Inventory, Raw Materials, Net of Reserves",
                            "terseLabel":  "Raw materials"
                            }
                        }
                    },
                "localname":  "InventoryRawMaterialsNetOfReserves",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/InventoryNetDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LeasesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Leases [Abstract]"
                            }
                        }
                    },
                "localname":  "LeasesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LegalEntityTypeOfCounterpartyDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Nature of the other party participating in a financial transaction.",
                            "label":  "Legal Entity Type of Counterparty [Domain]",
                            "terseLabel":  "Legal Entity Type of Counterparty [Domain]"
                            }
                        }
                    },
                "localname":  "LegalEntityTypeOfCounterpartyDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LesseeLeaseDescriptionLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Lessee, Lease, Description [Line Items]",
                            "terseLabel":  "Lessee, Lease, Description [Line Items]"
                            }
                        }
                    },
                "localname":  "LesseeLeaseDescriptionLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LesseeLeaseDescriptionTable":  {
                "auth_ref":  [
                    "r342"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about lessee's leases.",
                            "label":  "Lessee, Lease, Description [Table]",
                            "terseLabel":  "Lessee, Lease, Description [Table]"
                            }
                        }
                    },
                "localname":  "LesseeLeaseDescriptionTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LesseeOperatingLeaseDiscountRate":  {
                "auth_ref":  [
                    "r341"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Discount rate used by lessee to determine present value of operating lease payments.",
                            "label":  "Lessee, Operating Lease, Discount Rate",
                            "terseLabel":  "Weighted-average discount rate \u2014 operating leases"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseDiscountRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesSupplementalInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock":  {
                "auth_ref":  [
                    "r347"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of undiscounted cash flows of lessee's operating lease liability.  Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.",
                            "label":  "Lessee, Operating Lease, Liability, Maturity [Table Text Block]",
                            "terseLabel":  "Maturities of Lease Liabilities"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue":  {
                "auth_ref":  [
                    "r347"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetailsCalc2":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due",
                            "terseLabel":  "Minimum lease payments",
                            "totalLabel":  "Total lease payments"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails",
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive":  {
                "auth_ref":  [
                    "r347"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due after Year Five",
                            "terseLabel":  "2025 and thereafter"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive":  {
                "auth_ref":  [
                    "r347"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due Year Five",
                            "terseLabel":  "2024"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDueYearFive",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour":  {
                "auth_ref":  [
                    "r347"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due Year Four",
                            "terseLabel":  "2023"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDueYearFour",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree":  {
                "auth_ref":  [
                    "r347"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due Year Three",
                            "terseLabel":  "2022"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDueYearThree",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo":  {
                "auth_ref":  [
                    "r347"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due Year Two",
                            "terseLabel":  "2021"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDueYearTwo",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear":  {
                "auth_ref":  [
                    "r347"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year",
                            "terseLabel":  "Remainder of 2020"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount":  {
                "auth_ref":  [
                    "r347"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetailsCalc2":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.",
                            "label":  "Lessee, Operating Lease, Liability, Undiscounted Excess Amount",
                            "terseLabel":  "Less: imputed interest"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityUndiscountedExcessAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseRenewalTerm":  {
                "auth_ref":  [
                    "r340"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
                            "label":  "Lessee, Operating Lease, Renewal Term",
                            "terseLabel":  "Lease renewal term"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseRenewalTerm",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesNarrativeDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_LesseeOperatingLeasesTextBlock":  {
                "auth_ref":  [
                    "r349"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for operating leases of lessee.  Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability.",
                            "label":  "Lessee, Operating Leases [Text Block]",
                            "terseLabel":  "Leases"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeasesTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/Leases"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_LetterOfCreditMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A document typically issued by a financial institution which acts as a guarantee of payment to a beneficiary, or as the source of payment for a specific transaction (for example, wiring funds to a foreign exporter if and when specified merchandise is accepted pursuant to the terms of the letter of credit).",
                            "label":  "Letter of Credit [Member]",
                            "terseLabel":  "Letter of Credit"
                            }
                        }
                    },
                "localname":  "LetterOfCreditMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LettersOfCreditOutstandingAmount":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.",
                            "label":  "Letters of Credit Outstanding, Amount",
                            "terseLabel":  "Outstanding letters of credit"
                            }
                        }
                    },
                "localname":  "LettersOfCreditOutstandingAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_Liabilities":  {
                "auth_ref":  [
                    "r36"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LiabilitiesAndStockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized.  Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.",
                            "label":  "Liabilities",
                            "totalLabel":  "Total liabilities"
                            }
                        }
                    },
                "localname":  "Liabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LiabilitiesAndStockholdersEquity":  {
                "auth_ref":  [
                    "r25",
                    "r379",
                    "r393"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.",
                            "label":  "Liabilities and Equity",
                            "totalLabel":  "Total liabilities, redeemable noncontrolling interest and stockholders\u2019 equity"
                            }
                        }
                    },
                "localname":  "LiabilitiesAndStockholdersEquity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LiabilitiesAndStockholdersEquityAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Liabilities and Equity [Abstract]",
                            "terseLabel":  "Liabilities, redeemable noncontrolling interest and stockholders\u2019 equity"
                            }
                        }
                    },
                "localname":  "LiabilitiesAndStockholdersEquityAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LiabilitiesCurrent":  {
                "auth_ref":  [
                    "r38"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.",
                            "label":  "Liabilities, Current",
                            "totalLabel":  "Total current liabilities"
                            }
                        }
                    },
                "localname":  "LiabilitiesCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LiabilitiesCurrentAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Liabilities, Current [Abstract]",
                            "terseLabel":  "Current liabilities:"
                            }
                        }
                    },
                "localname":  "LiabilitiesCurrentAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LiabilitiesFairValueDisclosure":  {
                "auth_ref":  [
                    "r315"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fair value of financial and nonfinancial obligations.",
                            "label":  "Financial and Nonfinancial Liabilities, Fair Value Disclosure",
                            "totalLabel":  "Total"
                            }
                        }
                    },
                "localname":  "LiabilitiesFairValueDisclosure",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LiabilitiesFairValueDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Liabilities, Fair Value Disclosure [Abstract]",
                            "terseLabel":  "Liabilities:"
                            }
                        }
                    },
                "localname":  "LiabilitiesFairValueDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LicenseAndServiceMember":  {
                "auth_ref":  [
                    "r241"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Right to use intangible asset and performance of related service.  Intangible asset includes, but is not limited to, patent, copyright, technology, manufacturing process, software or trademark.",
                            "label":  "License and Service [Member]",
                            "terseLabel":  "SaaS and license",
                            "verboseLabel":  "SaaS and license revenue"
                            }
                        }
                    },
                "localname":  "LicenseAndServiceMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LineOfCredit":  {
                "auth_ref":  [
                    "r16",
                    "r378",
                    "r390"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount.  Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line.  Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.",
                            "label":  "Long-term Line of Credit",
                            "terseLabel":  "Long-term debt"
                            }
                        }
                    },
                "localname":  "LineOfCredit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity":  {
                "auth_ref":  [
                    "r35"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.",
                            "label":  "Line of Credit Facility, Current Borrowing Capacity",
                            "terseLabel":  "Current borrowing capacity"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityCurrentBorrowingCapacity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LineOfCreditFacilityInterestRateDuringPeriod":  {
                "auth_ref":  [
                    "r35"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The effective interest rate during the reporting period.",
                            "label":  "Line of Credit Facility, Interest Rate During Period",
                            "terseLabel":  "Effective interest rate (percent)"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityInterestRateDuringPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_LineOfCreditFacilityLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Line of Credit Facility [Line Items]",
                            "terseLabel":  "Line of Credit Facility [Line Items]"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity":  {
                "auth_ref":  [
                    "r35"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.",
                            "label":  "Line of Credit Facility, Maximum Borrowing Capacity",
                            "terseLabel":  "Maximum borrowing capacity"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityMaximumBorrowingCapacity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LineOfCreditFacilityTable":  {
                "auth_ref":  [
                    "r35",
                    "r85"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A table or schedule providing information pertaining to short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line.",
                            "label":  "Line of Credit Facility [Table]",
                            "terseLabel":  "Line of Credit Facility [Table]"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.",
                            "label":  "Line of Credit Facility, Unused Capacity, Commitment Fee Percentage",
                            "terseLabel":  "Unused line commitment fee (percentage)"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_LineOfCreditMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars.",
                            "label":  "Line of Credit [Member]",
                            "terseLabel":  "Line of Credit"
                            }
                        }
                    },
                "localname":  "LineOfCreditMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LitigationStatusAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by status of pending, threatened, or settled litigation.",
                            "label":  "Litigation Status [Axis]",
                            "terseLabel":  "Litigation Status [Axis]"
                            }
                        }
                    },
                "localname":  "LitigationStatusAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LitigationStatusDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Status of pending, threatened, or settled litigation.",
                            "label":  "Litigation Status [Domain]",
                            "terseLabel":  "Litigation Status [Domain]"
                            }
                        }
                    },
                "localname":  "LitigationStatusDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock":  {
                "auth_ref":  [
                    "r152"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for claims held for amounts due a entity, excluding financing receivables.  Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables.  Includes disclosure for allowance for credit losses.",
                            "label":  "Loans, Notes, Trade and Other Receivables Disclosure [Text Block]",
                            "terseLabel":  "Accounts Receivable, Net"
                            }
                        }
                    },
                "localname":  "LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNet"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_LoansReceivableBasisSpreadOnVariableRate":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable.  For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months).  LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate.  This element would be used to report separately the margin.",
                            "label":  "Loans Receivable, Basis Spread on Variable Rate",
                            "terseLabel":  "Basis spread on variable rate"
                            }
                        }
                    },
                "localname":  "LoansReceivableBasisSpreadOnVariableRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_LoansReceivableMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "An amount of money or property, or a portion thereof, leant to a borrower (debtor) in exchange for a promise to repay the amount borrowed plus interest at a date certain in the future.",
                            "label":  "Loans Receivable [Member]",
                            "terseLabel":  "Notes Receivable",
                            "verboseLabel":  "Loan Receivables"
                            }
                        }
                    },
                "localname":  "LoansReceivableMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAmortizedCostDetails",
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LondonInterbankOfferedRateLIBORMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Interest rate at which a bank borrows funds from other banks in the London interbank market.",
                            "label":  "London Interbank Offered Rate (LIBOR) [Member]",
                            "terseLabel":  "London Interbank Offered Rate (LIBOR)"
                            }
                        }
                    },
                "localname":  "LondonInterbankOfferedRateLIBORMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LongTermDebtNoncurrent":  {
                "auth_ref":  [
                    "r40"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer.  Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper.  Excludes capital lease obligations.",
                            "label":  "Long-term Debt, Excluding Current Maturities",
                            "terseLabel":  "Long-term debt"
                            }
                        }
                    },
                "localname":  "LongTermDebtNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongtermDebtTypeAxis":  {
                "auth_ref":  [
                    "r40"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of long-term debt.",
                            "label":  "Long-term Debt, Type [Axis]",
                            "terseLabel":  "Long-term Debt, Type [Axis]"
                            }
                        }
                    },
                "localname":  "LongtermDebtTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LongtermDebtTypeDomain":  {
                "auth_ref":  [
                    "r40",
                    "r219"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Type of long-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing.  These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.",
                            "label":  "Long-term Debt, Type [Domain]",
                            "terseLabel":  "Long-term Debt, Type [Domain]"
                            }
                        }
                    },
                "localname":  "LongtermDebtTypeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLettersOfCreditDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LossContingenciesLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Loss Contingencies [Line Items]",
                            "terseLabel":  "Loss Contingencies [Line Items]"
                            }
                        }
                    },
                "localname":  "LossContingenciesLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LossContingenciesTable":  {
                "auth_ref":  [
                    "r210",
                    "r211",
                    "r212",
                    "r213",
                    "r214",
                    "r215",
                    "r216",
                    "r217",
                    "r218"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Discloses the specific components (such as the nature, name, and date) of the loss contingency and gives an estimate of the possible loss or range of loss, or states that a reasonable estimate cannot be made.  Excludes environmental contingencies, warranties and unconditional purchase obligations.",
                            "label":  "Loss Contingencies [Table]",
                            "terseLabel":  "Loss Contingencies [Table]"
                            }
                        }
                    },
                "localname":  "LossContingenciesTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LossContingencyPatentsAllegedlyInfringedNumber":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of another entity's patents that the entity has allegedly infringed.",
                            "label":  "Loss Contingency, Patents Allegedly Infringed, Number",
                            "terseLabel":  "Number of patents allegedly infringed upon by the company"
                            }
                        }
                    },
                "localname":  "LossContingencyPatentsAllegedlyInfringedNumber",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "us-gaap_MeasurementInputDiscountRateMember":  {
                "auth_ref":  [
                    "r318"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Measurement input using interest rate to determine present value of future cash flows.",
                            "label":  "Measurement Input, Discount Rate [Member]",
                            "terseLabel":  "Measurement Input, Discount Rate"
                            }
                        }
                    },
                "localname":  "MeasurementInputDiscountRateMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_MeasurementInputTypeAxis":  {
                "auth_ref":  [
                    "r318"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of measurement input used to determine value of asset and liability.",
                            "label":  "Measurement Input Type [Axis]",
                            "terseLabel":  "Measurement Input Type [Axis]"
                            }
                        }
                    },
                "localname":  "MeasurementInputTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_MeasurementInputTypeDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Measurement input used to determine value of asset and liability.",
                            "label":  "Measurement Input Type [Domain]",
                            "terseLabel":  "Measurement Input Type [Domain]"
                            }
                        }
                    },
                "localname":  "MeasurementInputTypeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_MoneyMarketFundsMember":  {
                "auth_ref":  [
                    "r244"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fund that invests in short-term money-market instruments, for example, but not limited to, commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and other highly liquid securities.",
                            "label":  "Money Market Funds [Member]",
                            "terseLabel":  "Money market accounts"
                            }
                        }
                    },
                "localname":  "MoneyMarketFundsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_NatureOfOperations":  {
                "auth_ref":  [
                    "r108",
                    "r121"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings.  For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.",
                            "label":  "Nature of Operations [Text Block]",
                            "terseLabel":  "Organization"
                            }
                        }
                    },
                "localname":  "NatureOfOperations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/Organization"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_NetCashProvidedByUsedInFinancingActivities":  {
                "auth_ref":  [
                    "r73"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow (outflow) from financing activities, including discontinued operations.  Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.",
                            "label":  "Net Cash Provided by (Used in) Financing Activities",
                            "totalLabel":  "Cash flows from financing activities"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInFinancingActivities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Net Cash Provided by (Used in) Financing Activities [Abstract]",
                            "terseLabel":  "Cash flows from financing activities:"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInFinancingActivitiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NetCashProvidedByUsedInInvestingActivities":  {
                "auth_ref":  [
                    "r73"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow (outflow) from investing activities, including discontinued operations.  Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.",
                            "label":  "Net Cash Provided by (Used in) Investing Activities",
                            "totalLabel":  "Cash flows used in investing activities"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInInvestingActivities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Net Cash Provided by (Used in) Investing Activities [Abstract]",
                            "terseLabel":  "Cash flows used in investing activities:"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInInvestingActivitiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NetCashProvidedByUsedInOperatingActivities":  {
                "auth_ref":  [
                    "r73",
                    "r74",
                    "r77"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
                        "weight":  1.0
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow (outflow) from operating activities, including discontinued operations.  Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.",
                            "label":  "Net Cash Provided by (Used in) Operating Activities",
                            "totalLabel":  "Cash flows from / (used in) operating activities"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInOperatingActivities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]",
                            "verboseLabel":  "Cash flows from / (used in) operating activities:"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NetIncomeLoss":  {
                "auth_ref":  [
                    "r50",
                    "r51",
                    "r54",
                    "r77",
                    "r102",
                    "r386",
                    "r397"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic",
                        "weight":  1.0
                        },
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.",
                            "label":  "Net Income (Loss) Attributable to Parent",
                            "totalLabel":  "Net income",
                            "verboseLabel":  "Net income / (loss) attributable to common stockholders"
                            }
                        }
                    },
                "localname":  "NetIncomeLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity",
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest":  {
                "auth_ref":  [
                    "r60"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NetIncomeLoss",
                        "weight":  -1.0
                        },
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetIncomeLoss",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.",
                            "label":  "Net Income (Loss) Attributable to Redeemable Noncontrolling Interest",
                            "negatedLabel":  "Net loss attributable to redeemable noncontrolling interest",
                            "negatedTerseLabel":  "Net loss attributable to redeemable noncontrolling interest"
                            }
                        }
                    },
                "localname":  "NetIncomeLossAttributableToRedeemableNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic":  {
                "auth_ref":  [
                    "r91",
                    "r94"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.",
                            "label":  "Net Income (Loss) Available to Common Stockholders, Basic",
                            "totalLabel":  "Net income attributable to common stockholders"
                            }
                        }
                    },
                "localname":  "NetIncomeLossAvailableToCommonStockholdersBasic",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "New Accounting Pronouncements or Change in Accounting Principle [Line Items]",
                            "terseLabel":  "New Accounting Pronouncements or Change in Accounting Principle [Line Items]"
                            }
                        }
                    },
                "localname":  "NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable":  {
                "auth_ref":  [
                    "r90",
                    "r92"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Summarization of the changes in an accounting principle or a new accounting pronouncement, including the line items affected by the change and the financial effects of the change on those particular line items.",
                            "label":  "New Accounting Pronouncements or Change in Accounting Principle [Table]",
                            "terseLabel":  "New Accounting Pronouncements or Change in Accounting Principle [Table]"
                            }
                        }
                    },
                "localname":  "NewAccountingPronouncementsOrChangeInAccountingPrincipleTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting.  Includes, but is not limited to, quantification of the expected or actual impact.",
                            "label":  "New Accounting Pronouncements, Policy [Policy Text Block]",
                            "terseLabel":  "Recent Accounting Pronouncements"
                            }
                        }
                    },
                "localname":  "NewAccountingPronouncementsPolicyPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_NotesAndLoansReceivableGrossCurrent":  {
                "auth_ref":  [
                    "r4",
                    "r5",
                    "r45",
                    "r141"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, before allowance for credit loss, of financing receivable, classified as current.",
                            "label":  "Financing Receivable, before Allowance for Credit Loss, Current",
                            "terseLabel":  "Loan receivable, current"
                            }
                        }
                    },
                "localname":  "NotesAndLoansReceivableGrossCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NotesAndLoansReceivableNetCurrent":  {
                "auth_ref":  [
                    "r4",
                    "r5",
                    "r19",
                    "r140",
                    "r141",
                    "r381"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after allowance for credit loss, of financing receivable, classified as current.  Includes, but is not limited to, notes and loan receivable.",
                            "label":  "Financing Receivable, after Allowance for Credit Loss, Current",
                            "terseLabel":  "Outstanding balance",
                            "verboseLabel":  "Loan receivable, current"
                            }
                        }
                    },
                "localname":  "NotesAndLoansReceivableNetCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NotesAndLoansReceivableNetNoncurrent":  {
                "auth_ref":  [
                    "r20"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after allowance for credit loss, of financing receivable, classified as noncurrent.",
                            "label":  "Financing Receivable, after Allowance for Credit Loss, Noncurrent",
                            "terseLabel":  "Loan receivable, noncurrent"
                            }
                        }
                    },
                "localname":  "NotesAndLoansReceivableNetNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NotesReceivableGross":  {
                "auth_ref":  [
                    "r171"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, before allowance for credit loss, of financing receivable.",
                            "label":  "Financing Receivable, before Allowance for Credit Loss",
                            "totalLabel":  "Total",
                            "verboseLabel":  "Fair value of acquired note"
                            }
                        }
                    },
                "localname":  "NotesReceivableGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NotesReceivableMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) within one year of the balance sheet date.  Such amount may include accrued interest receivable in accordance with the terms of the note.  The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.",
                            "label":  "Notes Receivable [Member]",
                            "terseLabel":  "Notes Receivable"
                            }
                        }
                    },
                "localname":  "NotesReceivableMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAllowanceForCreditLossesNarrativeDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_NumberOfReportableSegments":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of segments reported by the entity.  A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.",
                            "label":  "Number of Reportable Segments",
                            "terseLabel":  "Number of reportable segments"
                            }
                        }
                    },
                "localname":  "NumberOfReportableSegments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "us-gaap_OperatingExpenses":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_OperatingIncomeLoss",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services.  Includes selling, general and administrative expense.",
                            "label":  "Operating Expenses",
                            "totalLabel":  "Total operating expenses"
                            }
                        }
                    },
                "localname":  "OperatingExpenses",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingExpensesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Operating Expenses [Abstract]",
                            "terseLabel":  "Operating expenses:"
                            }
                        }
                    },
                "localname":  "OperatingExpensesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OperatingIncomeLoss":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The net result for the period of deducting operating expenses from operating revenues.",
                            "label":  "Operating Income (Loss)",
                            "terseLabel":  "Operating income / (loss)",
                            "totalLabel":  "Operating income"
                            }
                        }
                    },
                "localname":  "OperatingIncomeLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseCost":  {
                "auth_ref":  [
                    "r343",
                    "r348"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term.  Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.",
                            "label":  "Operating Lease, Cost",
                            "terseLabel":  "Operating lease cost"
                            }
                        }
                    },
                "localname":  "OperatingLeaseCost",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesSupplementalInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseExpense":  {
                "auth_ref":  [
                    "r338"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of operating lease expense.  Excludes sublease income.",
                            "label":  "Operating Lease, Expense",
                            "terseLabel":  "Operating rent expense"
                            }
                        }
                    },
                "localname":  "OperatingLeaseExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Lessee, Operating Lease, Liability, Payment, Due [Abstract]",
                            "terseLabel":  "Maturities of Lease Liabilities Under Topic 842"
                            }
                        }
                    },
                "localname":  "OperatingLeaseLiabilitiesPaymentsDueAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OperatingLeaseLiability":  {
                "auth_ref":  [
                    "r337"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetailsCalc2":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Present value of lessee's discounted obligation for lease payments from operating lease.",
                            "label":  "Operating Lease, Liability",
                            "terseLabel":  "Present value of lease liabilities"
                            }
                        }
                    },
                "localname":  "OperatingLeaseLiability",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesMaturitiesOfLeaseLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseLiabilityCurrent":  {
                "auth_ref":  [
                    "r337"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_LiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.",
                            "label":  "Operating Lease, Liability, Current",
                            "terseLabel":  "Operating lease liabilities"
                            }
                        }
                    },
                "localname":  "OperatingLeaseLiabilityCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseLiabilityNoncurrent":  {
                "auth_ref":  [
                    "r337"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.",
                            "label":  "Operating Lease, Liability, Noncurrent",
                            "terseLabel":  "Operating lease liabilities"
                            }
                        }
                    },
                "localname":  "OperatingLeaseLiabilityNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeasePayments":  {
                "auth_ref":  [
                    "r339",
                    "r344"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.",
                            "label":  "Operating Lease, Payments",
                            "terseLabel":  "Cash paid for amounts included in the measurement of operating lease liabilities"
                            }
                        }
                    },
                "localname":  "OperatingLeasePayments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesSupplementalInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseRightOfUseAsset":  {
                "auth_ref":  [
                    "r336"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's right to use underlying asset under operating lease.",
                            "label":  "Operating Lease, Right-of-Use Asset",
                            "terseLabel":  "Operating lease right-of-use assets"
                            }
                        }
                    },
                "localname":  "OperatingLeaseRightOfUseAsset",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1":  {
                "auth_ref":  [
                    "r346",
                    "r348"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
                            "label":  "Operating Lease, Weighted Average Remaining Lease Term",
                            "terseLabel":  "Weighted-average remaining lease term \u2014 operating leases"
                            }
                        }
                    },
                "localname":  "OperatingLeaseWeightedAverageRemainingLeaseTerm1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesSupplementalInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_OperatingLossCarryforwardsLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Operating Loss Carryforwards [Line Items]",
                            "terseLabel":  "Operating Loss Carryforwards [Line Items]"
                            }
                        }
                    },
                "localname":  "OperatingLossCarryforwardsLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/IncomeTaxesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OperatingLossCarryforwardsTable":  {
                "auth_ref":  [
                    "r280"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule reflecting pertinent information, such as tax authority, amounts, and expiration dates, of net operating loss carryforwards, including an assessment of the likelihood of utilization.",
                            "label":  "Operating Loss Carryforwards [Table]",
                            "terseLabel":  "Operating Loss Carryforwards [Table]"
                            }
                        }
                    },
                "localname":  "OperatingLossCarryforwardsTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/IncomeTaxesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OperatingSegmentsMember":  {
                "auth_ref":  [
                    "r129",
                    "r135"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Identifies components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity.",
                            "label":  "Operating Segments [Member]",
                            "terseLabel":  "Operating Segments"
                            }
                        }
                    },
                "localname":  "OperatingSegmentsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Organization, Consolidation and Presentation of Financial Statements [Abstract]"
                            }
                        }
                    },
                "localname":  "OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OtherAccruedLiabilitiesNoncurrent":  {
                "auth_ref":  [
                    "r41"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LiabilitiesOtherLiabilitiesDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_OtherLiabilitiesNoncurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of expenses incurred but not yet paid classified as other, due after one year or the normal operating cycle, if longer.",
                            "label":  "Other Accrued Liabilities, Noncurrent",
                            "terseLabel":  "Other liabilities"
                            }
                        }
                    },
                "localname":  "OtherAccruedLiabilitiesNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LiabilitiesOtherLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherAssetsCurrent":  {
                "auth_ref":  [
                    "r48"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_AssetsCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of current assets classified as other.",
                            "label":  "Other Assets, Current",
                            "terseLabel":  "Other current assets, net of allowance for credit losses of $39 and $16, respectively",
                            "verboseLabel":  "Other current assets"
                            }
                        }
                    },
                "localname":  "OtherAssetsCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails",
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherAssetsDisclosureTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for other assets.  This disclosure includes other current assets and other noncurrent assets.",
                            "label":  "Other Assets Disclosure [Text Block]",
                            "terseLabel":  "Other Assets"
                            }
                        }
                    },
                "localname":  "OtherAssetsDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssets"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_OtherAssetsMember":  {
                "auth_ref":  [
                    "r311",
                    "r313"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Primary financial statement caption encompassing other assets.",
                            "label":  "Other Assets [Member]",
                            "verboseLabel":  "Other Assets"
                            }
                        }
                    },
                "localname":  "OtherAssetsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_OtherAssetsNoncurrent":  {
                "auth_ref":  [
                    "r33"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of noncurrent assets classified as other.",
                            "label":  "Other Assets, Noncurrent",
                            "terseLabel":  "Other assets, net of allowance for credit losses of $77 and $0, respectively",
                            "verboseLabel":  "Other assets"
                            }
                        }
                    },
                "localname":  "OtherAssetsNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails",
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherCurrentAssetsMember":  {
                "auth_ref":  [
                    "r311",
                    "r313"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Primary financial statement caption encompassing other current assets.",
                            "label":  "Other Current Assets [Member]",
                            "terseLabel":  "Other Current Assets"
                            }
                        }
                    },
                "localname":  "OtherCurrentAssetsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_OtherIntangibleAssetsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Intangible assets classified as other.",
                            "label":  "Other Intangible Assets [Member]",
                            "terseLabel":  "Other"
                            }
                        }
                    },
                "localname":  "OtherIntangibleAssetsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_OtherLiabilitiesCurrent":  {
                "auth_ref":  [
                    "r8",
                    "r9",
                    "r37"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/LiabilitiesComponentsOfAccountsPayableAccruedExpensesAndOtherCurrentLiabilitiesDetails":  {
                        "order":  3.0,
                        "parentTag":  "alrm_AccountsPayableAccruedLiabilitiesandOtherCurrentLiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.",
                            "label":  "Other Liabilities, Current",
                            "terseLabel":  "Other current liabilities"
                            }
                        }
                    },
                "localname":  "OtherLiabilitiesCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LiabilitiesComponentsOfAccountsPayableAccruedExpensesAndOtherCurrentLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherLiabilitiesNoncurrent":  {
                "auth_ref":  [
                    "r41"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        },
                    "http://www.alarm.com/role/LiabilitiesOtherLiabilitiesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.",
                            "label":  "Other Liabilities, Noncurrent",
                            "terseLabel":  "Other liabilities",
                            "totalLabel":  "Total Other liabilities"
                            }
                        }
                    },
                "localname":  "OtherLiabilitiesNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets",
                    "http://www.alarm.com/role/LiabilitiesOtherLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherNonoperatingIncomeExpense":  {
                "auth_ref":  [
                    "r63"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of income (expense) related to nonoperating activities, classified as other.",
                            "label":  "Other Nonoperating Income (Expense)",
                            "terseLabel":  "Other income, net"
                            }
                        }
                    },
                "localname":  "OtherNonoperatingIncomeExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PatentsMember":  {
                "auth_ref":  [
                    "r295"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exclusive legal right granted by the government to the owner of the patent to exploit an invention or a process for a period of time specified by law.",
                            "label":  "Patents [Member]",
                            "terseLabel":  "Patent Licenses"
                            }
                        }
                    },
                "localname":  "PatentsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_PayablesAndAccrualsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Payables and Accruals [Abstract]"
                            }
                        }
                    },
                "localname":  "PayablesAndAccrualsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_PaymentsForRepurchaseOfCommonStock":  {
                "auth_ref":  [
                    "r70"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflow to reacquire common stock during the period.",
                            "label":  "Payments for Repurchase of Common Stock",
                            "negatedLabel":  "Purchases of treasury stock"
                            }
                        }
                    },
                "localname":  "PaymentsForRepurchaseOfCommonStock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsToAcquireBusinessesGross":  {
                "auth_ref":  [
                    "r66",
                    "r301"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflow associated with the acquisition of business during the period.  The cash portion only of the acquisition price.",
                            "label":  "Payments to Acquire Businesses, Gross",
                            "verboseLabel":  "Consideration"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquireBusinessesGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsToAcquireInProcessResearchAndDevelopment":  {
                "auth_ref":  [
                    "r66"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflows from the purchase of net carrying value allocated to in-process research and development costs and materials acquired in a business combination.",
                            "label":  "Payments to Acquire in Process Research and Development",
                            "negatedTerseLabel":  "Purchases of in-process research and development"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquireInProcessResearchAndDevelopment",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsToAcquireNotesReceivable":  {
                "auth_ref":  [
                    "r65"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date.  Such amount may include accrued interest receivable in accordance with the terms of the note.  The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.",
                            "label":  "Payments to Acquire Notes Receivable",
                            "negatedTerseLabel":  "Issuances or purchases of notes receivable",
                            "terseLabel":  "Payments to acquire notes receivable"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquireNotesReceivable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment":  {
                "auth_ref":  [
                    "r67"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.",
                            "label":  "Payments to Acquire Property, Plant, and Equipment",
                            "negatedTerseLabel":  "Additions to property and equipment",
                            "terseLabel":  "Additions to property and equipment"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquirePropertyPlantAndEquipment",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PendingLitigationMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Risk of loss associated with the outcome of pending litigation against the entity, for example, but not limited to, litigation in arbitration or within the trial process.",
                            "label":  "Pending Litigation [Member]",
                            "terseLabel":  "Pending Litigation"
                            }
                        }
                    },
                "localname":  "PendingLitigationMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesLegalProceedingsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_PlanNameAxis":  {
                "auth_ref":  [
                    "r252",
                    "r261"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by plan name for share-based payment arrangement.",
                            "label":  "Plan Name [Axis]",
                            "terseLabel":  "Plan Name [Axis]"
                            }
                        }
                    },
                "localname":  "PlanNameAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_PlanNameDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Plan name for share-based payment arrangement.",
                            "label":  "Plan Name [Domain]",
                            "terseLabel":  "Plan Name [Domain]"
                            }
                        }
                    },
                "localname":  "PlanNameDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_PreferredStockMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Preferred shares may provide a preferential dividend to the dividend on common stock and may take precedence over common stock in the event of a liquidation.  Preferred shares typically represent an ownership interest in the company.",
                            "label":  "Preferred Stock [Member]",
                            "terseLabel":  "Preferred Stock"
                            }
                        }
                    },
                "localname":  "PreferredStockMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_PreferredStockParOrStatedValuePerShare":  {
                "auth_ref":  [
                    "r17"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.",
                            "label":  "Preferred Stock, Par or Stated Value Per Share",
                            "terseLabel":  "Preferred stock, par value (in dollars per share)"
                            }
                        }
                    },
                "localname":  "PreferredStockParOrStatedValuePerShare",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_PreferredStockSharesAuthorized":  {
                "auth_ref":  [
                    "r17"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.",
                            "label":  "Preferred Stock, Shares Authorized",
                            "terseLabel":  "Preferred stock, shares authorized (in shares)"
                            }
                        }
                    },
                "localname":  "PreferredStockSharesAuthorized",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_PreferredStockSharesIssued":  {
                "auth_ref":  [
                    "r17"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury).  May be all or portion of the number of preferred shares authorized.  Excludes preferred shares that are classified as debt.",
                            "label":  "Preferred Stock, Shares Issued",
                            "terseLabel":  "Preferred stock, shares issued (in shares)"
                            }
                        }
                    },
                "localname":  "PreferredStockSharesIssued",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_PreferredStockSharesOutstanding":  {
                "auth_ref":  [
                    "r17"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders.  Does not include preferred shares that have been repurchased.",
                            "label":  "Preferred Stock, Shares Outstanding",
                            "terseLabel":  "Preferred stock, shares outstanding (in shares)"
                            }
                        }
                    },
                "localname":  "PreferredStockSharesOutstanding",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_PreferredStockValue":  {
                "auth_ref":  [
                    "r17"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer).  This item includes treasury stock repurchased by the entity.  Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.",
                            "label":  "Preferred Stock, Value, Issued",
                            "terseLabel":  "Preferred stock, $0.001 par value, 10,000,000 shares authorized; no shares issued and outstanding as of March 31, 2020 and December 31, 2019."
                            }
                        }
                    },
                "localname":  "PreferredStockValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PrepaidExpenseCurrentAndNoncurrent":  {
                "auth_ref":  [
                    "r382",
                    "r396"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs.",
                            "label":  "Prepaid Expense",
                            "terseLabel":  "Prepaid expense"
                            }
                        }
                    },
                "localname":  "PrepaidExpenseCurrentAndNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAllowanceForCreditLossesNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PriorPeriodReclassificationAdjustmentDescription":  {
                "auth_ref":  [
                    "r0"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for reclassifications that affects the comparability of the financial statements.",
                            "label":  "Reclassification, Policy [Policy Text Block]",
                            "terseLabel":  "Reclassifications"
                            }
                        }
                    },
                "localname":  "PriorPeriodReclassificationAdjustmentDescription",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ProceedsFromCollectionOfNotesReceivable":  {
                "auth_ref":  [
                    "r64"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.",
                            "label":  "Proceeds from Collection of Notes Receivable",
                            "terseLabel":  "Receipt of payment on notes receivable"
                            }
                        }
                    },
                "localname":  "ProceedsFromCollectionOfNotesReceivable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions":  {
                "auth_ref":  [
                    "r68",
                    "r262"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow from issuance of shares under share-based payment arrangement.  Includes, but is not limited to, option exercised.",
                            "label":  "Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised",
                            "terseLabel":  "Issuances of common stock from equity-based plans"
                            }
                        }
                    },
                "localname":  "ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromLinesOfCredit":  {
                "auth_ref":  [
                    "r69",
                    "r86"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.",
                            "label":  "Proceeds from Lines of Credit",
                            "terseLabel":  "Proceeds from credit facility",
                            "verboseLabel":  "Proceeds from line of credit"
                            }
                        }
                    },
                "localname":  "ProceedsFromLinesOfCredit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProfitLoss":  {
                "auth_ref":  [
                    "r50",
                    "r51",
                    "r72",
                    "r131",
                    "r136",
                    "r306",
                    "r307",
                    "r308",
                    "r309",
                    "r310"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        },
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.",
                            "label":  "Net Income (Loss), Including Portion Attributable to Noncontrolling Interest",
                            "terseLabel":  "Net income",
                            "totalLabel":  "Net income",
                            "verboseLabel":  "Net income"
                            }
                        }
                    },
                "localname":  "ProfitLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows",
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentNet":  {
                "auth_ref":  [
                    "r12",
                    "r13",
                    "r204",
                    "r394"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale.  Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
                            "label":  "Property, Plant and Equipment, Net",
                            "terseLabel":  "Property and equipment, net"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProvisionForDoubtfulAccounts":  {
                "auth_ref":  [
                    "r57",
                    "r160"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  19.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of expense (reversal of expense) for expected credit loss on accounts receivable.",
                            "label":  "Accounts Receivable, Credit Loss Expense (Reversal)",
                            "negatedTerseLabel":  "Provision for credit losses on accounts receivable",
                            "terseLabel":  "Provision for credit losses on accounts receivable",
                            "verboseLabel":  "Provision (provision reduction) for doubtful accounts"
                            }
                        }
                    },
                "localname":  "ProvisionForDoubtfulAccounts",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetNarrativeDetails",
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails",
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProvisionForLoanLossesExpensed":  {
                "auth_ref":  [
                    "r160",
                    "r380",
                    "r384"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of credit loss expense (reversal of expense) for financing receivable.",
                            "label":  "Financing Receivable, Credit Loss, Expense (Reversal)",
                            "negatedTerseLabel":  "Provision for credit losses on notes receivable",
                            "terseLabel":  "Provision for credit losses on notes receivable",
                            "verboseLabel":  "Expense (reversal) related to promissory note"
                            }
                        }
                    },
                "localname":  "ProvisionForLoanLossesExpensed",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails",
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ReceivableTypeDomain":  {
                "auth_ref":  [
                    "r46"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Financing arrangement representing a contractual right to receive money either on demand or on fixed and determinable dates.",
                            "label":  "Receivable [Domain]",
                            "terseLabel":  "Receivable [Domain]"
                            }
                        }
                    },
                "localname":  "ReceivableTypeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAllowanceForCreditLossesNarrativeDetails",
                    "http://www.alarm.com/role/OtherAssetsAmortizedCostDetails",
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails",
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ReceivableWithImputedInterestFaceAmount":  {
                "auth_ref":  [
                    "r333"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The principal amount of the receivable or note before consideration of the discount or premium.",
                            "label":  "Receivable with Imputed Interest, Face Amount",
                            "terseLabel":  "Receivable, face amount"
                            }
                        }
                    },
                "localname":  "ReceivableWithImputedInterestFaceAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ReceivablesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Receivables [Abstract]"
                            }
                        }
                    },
                "localname":  "ReceivablesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount":  {
                "auth_ref":  [
                    "r220",
                    "r221",
                    "r222",
                    "r223"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_LiabilitiesAndStockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity.  This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.",
                            "label":  "Redeemable Noncontrolling Interest, Equity, Carrying Amount",
                            "periodEndLabel":  "Ending balance",
                            "periodStartLabel":  "Beginning balance",
                            "terseLabel":  "Redeemable noncontrolling interest"
                            }
                        }
                    },
                "localname":  "RedeemableNoncontrollingInterestEquityCarryingAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets",
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RelatedPartyDomain":  {
                "auth_ref":  [
                    "r356"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Related parties include affiliates; other entities for which investments are accounted for by the equity method by the entity; trusts for benefit of employees; and principal owners, management, and members of immediate families.  It also may include other parties with which the entity may control or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests.",
                            "label":  "Related Party [Domain]",
                            "terseLabel":  "Related Party [Domain]"
                            }
                        }
                    },
                "localname":  "RelatedPartyDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty":  {
                "auth_ref":  [
                    "r350"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.",
                            "label":  "Related Party Transaction, Expenses from Transactions with Related Party",
                            "terseLabel":  "Expenses incurred from related party"
                            }
                        }
                    },
                "localname":  "RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RelatedPartyTransactionLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Related Party Transaction [Line Items]",
                            "terseLabel":  "Related Party Transaction [Line Items]"
                            }
                        }
                    },
                "localname":  "RelatedPartyTransactionLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RelatedPartyTransactionsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Related Party Transactions [Abstract]"
                            }
                        }
                    },
                "localname":  "RelatedPartyTransactionsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RelatedPartyTransactionsByRelatedPartyAxis":  {
                "auth_ref":  [
                    "r246",
                    "r351",
                    "r352",
                    "r363",
                    "r364",
                    "r365",
                    "r366",
                    "r367",
                    "r368",
                    "r369",
                    "r370",
                    "r371",
                    "r372",
                    "r373",
                    "r374"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of related party.  Related parties include, but not limited to, affiliates; other entities for which investments are accounted for by the equity method by the entity; trusts for benefit of employees; and principal owners, management, and members of immediate families.  It also may include other parties with which the entity may control or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests.",
                            "label":  "Related Party [Axis]",
                            "terseLabel":  "Related Party [Axis]"
                            }
                        }
                    },
                "localname":  "RelatedPartyTransactionsByRelatedPartyAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RelatedPartyTransactionsDisclosureTextBlock":  {
                "auth_ref":  [
                    "r356"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for related party transactions.  Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.",
                            "label":  "Related Party Transactions Disclosure [Text Block]",
                            "terseLabel":  "Related Party Transactions"
                            }
                        }
                    },
                "localname":  "RelatedPartyTransactionsDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactions"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_RepaymentsOfLinesOfCredit":  {
                "auth_ref":  [
                    "r71",
                    "r86"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.",
                            "label":  "Repayments of Lines of Credit",
                            "negatedTerseLabel":  "Repayments of credit facility",
                            "terseLabel":  "Repayments of lines of credit"
                            }
                        }
                    },
                "localname":  "RepaymentsOfLinesOfCredit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows",
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ResearchAndDevelopmentExpense":  {
                "auth_ref":  [
                    "r267",
                    "r407"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_OperatingExpenses",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.",
                            "label":  "Research and Development Expense",
                            "terseLabel":  "Research and development"
                            }
                        }
                    },
                "localname":  "ResearchAndDevelopmentExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ResearchAndDevelopmentExpenseMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Primary financial statement caption in which the reported facts about research and development expense have been included.",
                            "label":  "Research and Development Expense [Member]",
                            "terseLabel":  "Research and development"
                            }
                        }
                    },
                "localname":  "ResearchAndDevelopmentExpenseMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ResearchAndDevelopmentInProcess":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  11.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of purchased research and development assets that are acquired in a business combination have no alternative future use and are therefore written off in the period of acquisition.",
                            "label":  "Research and Development in Process",
                            "terseLabel":  "Acquired in-process research and development",
                            "verboseLabel":  "Consideration transferred"
                            }
                        }
                    },
                "localname":  "ResearchAndDevelopmentInProcess",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAssetAcquisitionDetails",
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ResearchMember":  {
                "auth_ref":  [
                    "r280"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Research tax credit carryforwards arising from certain qualifying expenditures incurred to develop new products and processes.",
                            "label":  "Research Tax Credit Carryforward [Member]",
                            "terseLabel":  "Research Tax Credit Carryforward"
                            }
                        }
                    },
                "localname":  "ResearchMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/IncomeTaxesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Type of cash and cash equivalent.  Cash is currency on hand as well as demand deposits with banks or financial institutions.  Includes other kinds of accounts that have the general characteristics of demand deposits.  Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
                            "label":  "Cash and Cash Equivalents [Domain]",
                            "terseLabel":  "Cash and Cash Equivalents [Domain]"
                            }
                        }
                    },
                "localname":  "RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_RestrictedStockUnitsRSUMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met.",
                            "label":  "Restricted Stock Units (RSUs) [Member]",
                            "terseLabel":  "Restricted stock units"
                            }
                        }
                    },
                "localname":  "RestrictedStockUnitsRSUMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails",
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails",
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_RetainedEarningsAccumulatedDeficit":  {
                "auth_ref":  [
                    "r22",
                    "r229",
                    "r392"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
                            "label":  "Retained Earnings (Accumulated Deficit)",
                            "negatedTerseLabel":  "Accumulated deficit",
                            "terseLabel":  "Accumulated deficit"
                            }
                        }
                    },
                "localname":  "RetainedEarningsAccumulatedDeficit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationRegardingLeasesDetails",
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RetainedEarningsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
                            "label":  "Retained Earnings [Member]",
                            "terseLabel":  "Accumulated Deficit"
                            }
                        }
                    },
                "localname":  "RetainedEarningsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_RevenueFromContractWithCustomerAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Revenue from Contract with Customer [Abstract]"
                            }
                        }
                    },
                "localname":  "RevenueFromContractWithCustomerAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax":  {
                "auth_ref":  [
                    "r237",
                    "r238"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_OperatingIncomeLoss",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer.  Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.",
                            "label":  "Revenue from Contract with Customer, Excluding Assessed Tax",
                            "terseLabel":  "Total revenue",
                            "verboseLabel":  "Revenue from distribution partners"
                            }
                        }
                    },
                "localname":  "RevenueFromContractWithCustomerExcludingAssessedTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RevenueFromContractWithCustomerPolicyTextBlock":  {
                "auth_ref":  [
                    "r81",
                    "r243"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for revenue from contract with customer.",
                            "label":  "Revenue from Contract with Customer [Policy Text Block]",
                            "terseLabel":  "Contract Assets and Contract Liabilities"
                            }
                        }
                    },
                "localname":  "RevenueFromContractWithCustomerPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_RevenueFromContractWithCustomerTextBlock":  {
                "auth_ref":  [
                    "r243"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset.  Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer.  Excludes insurance and lease contracts.",
                            "label":  "Revenue from Contract with Customer [Text Block]",
                            "terseLabel":  "Revenue from Contracts with Customer"
                            }
                        }
                    },
                "localname":  "RevenueFromContractWithCustomerTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RevenueFromContractsWithCustomers"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_RevenueRecognitionPolicyTextBlock":  {
                "auth_ref":  [
                    "r81",
                    "r82"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for revenue.  Includes revenue from contract with customer and from other sources.",
                            "label":  "Revenue [Policy Text Block]",
                            "terseLabel":  "Revenue Recognition"
                            }
                        }
                    },
                "localname":  "RevenueRecognitionPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_RevenuesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Revenues [Abstract]",
                            "terseLabel":  "Revenue:"
                            }
                        }
                    },
                "localname":  "RevenuesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RevolvingCreditFacilityMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount.",
                            "label":  "Revolving Credit Facility [Member]",
                            "terseLabel":  "Revolving Credit Facility"
                            }
                        }
                    },
                "localname":  "RevolvingCreditFacilityMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability":  {
                "auth_ref":  [
                    "r345",
                    "r348"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase in right-of-use asset obtained in exchange for operating lease liability.",
                            "label":  "Right-of-Use Asset Obtained in Exchange for Operating Lease Liability",
                            "terseLabel":  "Operating lease right-of-use assets obtained in exchange for new operating lease liabilities"
                            }
                        }
                    },
                "localname":  "RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LeasesLeasesSupplementalInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RisksAndUncertaintiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Risks and Uncertainties [Abstract]"
                            }
                        }
                    },
                "localname":  "RisksAndUncertaintiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SalesRevenueNetMember":  {
                "auth_ref":  [
                    "r115"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Revenue from sale of product and rendering of service and other sources of income, when it serves as benchmark in concentration of risk calculation.",
                            "label":  "Revenue Benchmark [Member]",
                            "terseLabel":  "Revenue"
                            }
                        }
                    },
                "localname":  "SalesRevenueNetMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails",
                    "http://www.alarm.com/role/SignificantServiceProvidersDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable":  {
                "auth_ref":  [
                    "r46"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule itemizing specific types of trade accounts and notes receivable, and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date.  Presentation is categorized by current, noncurrent and unclassified receivables.",
                            "label":  "Schedule of Accounts, Notes, Loans and Financing Receivable [Table]",
                            "terseLabel":  "Schedule of Accounts, Notes, Loans and Financing Receivable [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfAccountsNotesLoansAndFinancingReceivableTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetNarrativeDetails",
                    "http://www.alarm.com/role/AccountsReceivableNetScheduleOfCreditLossesDetails",
                    "http://www.alarm.com/role/OtherAssetsCreditQualtiyIndicatorsDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToHardwareSupplierDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock":  {
                "auth_ref":  [
                    "r46"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date.  Presentation is categorized by current, noncurrent and unclassified receivables.",
                            "label":  "Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]",
                            "terseLabel":  "Schedule of Components of Accounts Receivable"
                            }
                        }
                    },
                "localname":  "ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AccountsReceivableNetTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities.  Examples include taxes, interest, rent and utilities.  Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).  An alternative caption includes accrued expenses.",
                            "label":  "Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]",
                            "terseLabel":  "Schedule of Accounts Payable, Accrued Expenses and Other Current Liabilities"
                            }
                        }
                    },
                "localname":  "ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/LiabilitiesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable":  {
                "auth_ref":  [
                    "r101"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule for securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by Antidilutive Securities.",
                            "label":  "Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]",
                            "terseLabel":  "Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/EarningsPerShareScheduleOfSecuritiesExcludedFromCalculationOfDilutedWeightedAverageCommonSharesOutstandingDueToAntiDilutiveEffectDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock":  {
                "auth_ref":  [
                    "r101"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.",
                            "label":  "Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]",
                            "terseLabel":  "Schedule of Securities Excluded from Calculation of Diluted Weighted Average Common Shares Outstanding Due to Anti-dilutive Effect"
                            }
                        }
                    },
                "localname":  "ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/EarningsPerShareTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable":  {
                "auth_ref":  [
                    "r287",
                    "r288"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule reflecting each material business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities.",
                            "label":  "Schedule of Business Acquisitions, by Acquisition [Table]",
                            "terseLabel":  "Schedule of Business Acquisitions, by Acquisition [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfBusinessAcquisitionsByAcquisitionTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/AcquisitionsAssetAcquisitionDetails",
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock":  {
                "auth_ref":  [
                    "r287",
                    "r288"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities.  This table does not include leveraged buyouts.",
                            "label":  "Schedule of Business Acquisitions, by Acquisition [Table Text Block]",
                            "terseLabel":  "Schedule of Consideration Paid and Estimated Fair Value of Tangible and Intangible Net Assets Acquired"
                            }
                        }
                    },
                "localname":  "ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock":  {
                "auth_ref":  [
                    "r259"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of cost recognized for award under share-based payment arrangement by plan.  Includes, but is not limited to, related tax benefit.",
                            "label":  "Share-based Payment Arrangement, Cost by Plan [Table Text Block]",
                            "terseLabel":  "Schedule of Stock-Based Compensation Expense"
                            }
                        }
                    },
                "localname":  "ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock":  {
                "auth_ref":  [
                    "r102"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.",
                            "label":  "Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]",
                            "terseLabel":  "Components of Basic and Diluted EPS"
                            }
                        }
                    },
                "localname":  "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/EarningsPerShareTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable":  {
                "auth_ref":  [
                    "r250",
                    "r259",
                    "r263"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about amount recognized for award under share-based payment arrangement.  Includes, but is not limited to, amount expensed in statement of income or comprehensive income, amount capitalized in statement of financial position, and corresponding reporting line item in financial statements.",
                            "label":  "Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table]",
                            "terseLabel":  "Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock":  {
                "auth_ref":  [
                    "r315",
                    "r316"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis.  The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).",
                            "label":  "Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]",
                            "terseLabel":  "Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis"
                            }
                        }
                    },
                "localname":  "ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/FairValueMeasurementsTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable":  {
                "auth_ref":  [
                    "r163"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about allowance for credit loss on financing receivable.",
                            "label":  "Financing Receivable, Allowance for Credit Loss [Table]",
                            "terseLabel":  "Financing Receivable, Allowance for Credit Loss [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfFinancingReceivableAllowanceForCreditLossesTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsAmortizedCostDetails",
                    "http://www.alarm.com/role/OtherAssetsScheduleOfNotesReceivableCreditLossesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfFinancingReceivablesNonAccrualStatusTableTextBlock":  {
                "auth_ref":  [
                    "r149",
                    "r168"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of financing receivable on nonaccrual status.",
                            "label":  "Financing Receivable, Nonaccrual [Table Text Block]",
                            "terseLabel":  "Schedule of Amortized Cost of Notes Receivable"
                            }
                        }
                    },
                "localname":  "ScheduleOfFinancingReceivablesNonAccrualStatusTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsOtherAssetsTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable":  {
                "auth_ref":  [
                    "r193",
                    "r197"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.",
                            "label":  "Schedule of Finite-Lived Intangible Assets [Table]",
                            "terseLabel":  "Schedule of Finite-Lived Intangible Assets [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfFiniteLivedIntangibleAssetsTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfNetCarryingAmountOfIntangibleAssetsDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails",
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock":  {
                "auth_ref":  [
                    "r193",
                    "r197"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment.",
                            "label":  "Schedule of Finite-Lived Intangible Assets [Table Text Block]",
                            "terseLabel":  "Schedule of Intangible Assets"
                            }
                        }
                    },
                "localname":  "ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfGoodwillTable":  {
                "auth_ref":  [
                    "r189",
                    "r191"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule of goodwill and the changes during the year due to acquisition, sale, impairment or for other reasons.",
                            "label":  "Schedule of Goodwill [Table]",
                            "terseLabel":  "Schedule of Goodwill [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfGoodwillTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfGoodwillDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfGoodwillTextBlock":  {
                "auth_ref":  [
                    "r189",
                    "r191"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.",
                            "label":  "Schedule of Goodwill [Table Text Block]",
                            "terseLabel":  "Schedule of Goodwill"
                            }
                        }
                    },
                "localname":  "ScheduleOfGoodwillTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfInventoryCurrentTableTextBlock":  {
                "auth_ref":  [
                    "r11",
                    "r28",
                    "r29",
                    "r30"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.",
                            "label":  "Schedule of Inventory, Current [Table Text Block]",
                            "terseLabel":  "Schedule of Components of Inventory"
                            }
                        }
                    },
                "localname":  "ScheduleOfInventoryCurrentTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/InventoryNetTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock":  {
                "auth_ref":  [
                    "r90",
                    "r92",
                    "r105",
                    "r106",
                    "r107"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.",
                            "label":  "Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]",
                            "terseLabel":  "Schedule of New Accounting Pronouncements"
                            }
                        }
                    },
                "localname":  "ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable":  {
                "auth_ref":  [
                    "r84",
                    "r351",
                    "r352",
                    "r353",
                    "r354",
                    "r355"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule of quantitative and qualitative information pertaining to related party transactions.  Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.",
                            "label":  "Schedule of Related Party Transactions, by Related Party [Table]",
                            "terseLabel":  "Schedule of Related Party Transactions, by Related Party [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfRelatedPartyTransactionsByRelatedPartyTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/RelatedPartyTransactionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable":  {
                "auth_ref":  [
                    "r128",
                    "r131",
                    "r133",
                    "r134",
                    "r189"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A table disclosing the profit or loss and total assets for each reportable segment of the entity.  An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.",
                            "label":  "Schedule of Segment Reporting Information, by Segment [Table]",
                            "terseLabel":  "Schedule of Segment Reporting Information, by Segment [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfSegmentReportingInformationBySegmentTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock":  {
                "auth_ref":  [
                    "r128",
                    "r131",
                    "r133",
                    "r134",
                    "r189"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the profit or loss and total assets for each reportable segment.  An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.",
                            "label":  "Schedule of Segment Reporting Information, by Segment [Table Text Block]",
                            "terseLabel":  "Schedule of Reportable Segment Operational Data"
                            }
                        }
                    },
                "localname":  "ScheduleOfSegmentReportingInformationBySegmentTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable":  {
                "auth_ref":  [
                    "r252",
                    "r261"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about share-based payment arrangement.",
                            "label":  "Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]",
                            "terseLabel":  "Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SegmentDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity.",
                            "label":  "Segments [Domain]",
                            "terseLabel":  "Segments [Domain]"
                            }
                        }
                    },
                "localname":  "SegmentDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetNarrativeDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfGoodwillDetails",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_SegmentReportingAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Segment Reporting [Abstract]"
                            }
                        }
                    },
                "localname":  "SegmentReportingAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SegmentReportingDisclosureTextBlock":  {
                "auth_ref":  [
                    "r139"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for reporting segments including data and tables.  Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.",
                            "label":  "Segment Reporting Disclosure [Text Block]",
                            "terseLabel":  "Segment Information"
                            }
                        }
                    },
                "localname":  "SegmentReportingDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformation"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_SegmentReportingInformationLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Segment Reporting Information [Line Items]",
                            "terseLabel":  "Segment Reporting Information [Line Items]"
                            }
                        }
                    },
                "localname":  "SegmentReportingInformationLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SellingAndMarketingExpense":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_OperatingExpenses",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The aggregate total amount of expenses directly related to the marketing or selling of products or services.",
                            "label":  "Selling and Marketing Expense",
                            "terseLabel":  "Sales and marketing"
                            }
                        }
                    },
                "localname":  "SellingAndMarketingExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_SellingAndMarketingExpenseMember":  {
                "auth_ref":  [
                    "r56"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Primary financial statement caption encompassing selling and marketing expense.",
                            "label":  "Selling and Marketing Expense [Member]",
                            "terseLabel":  "Sales and marketing"
                            }
                        }
                    },
                "localname":  "SellingAndMarketingExpenseMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ShareBasedCompensation":  {
                "auth_ref":  [
                    "r75"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows":  {
                        "order":  10.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of noncash expense for share-based payment arrangement.",
                            "label":  "Share-based Payment Arrangement, Noncash Expense",
                            "terseLabel":  "Stock-based compensation"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensation",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod":  {
                "auth_ref":  [
                    "r255"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period",
                            "terseLabel":  "Restricted stock units granted (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod":  {
                "auth_ref":  [
                    "r256"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period",
                            "terseLabel":  "Restricted stock units vested (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award [Line Items]",
                            "terseLabel":  "Share-based Compensation Arrangement by Share-based Payment Award [Line Items]"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Gross number of share options (or share units) granted during the period.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross",
                            "terseLabel":  "Stock options granted (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain":  {
                "auth_ref":  [
                    "r249",
                    "r253"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Award under share-based payment arrangement.",
                            "label":  "Award Type [Domain]",
                            "terseLabel":  "Award Type [Domain]"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails",
                    "http://www.alarm.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_SharesOutstanding":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of shares issued which are neither cancelled nor held in the treasury.",
                            "label":  "Shares, Outstanding",
                            "periodEndLabel":  "Balance (in shares)",
                            "periodStartLabel":  "Balance (in shares)"
                            }
                        }
                    },
                "localname":  "SharesOutstanding",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_StatementBusinessSegmentsAxis":  {
                "auth_ref":  [
                    "r1",
                    "r131",
                    "r189",
                    "r207",
                    "r208",
                    "r209",
                    "r400"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by business segments.",
                            "label":  "Segments [Axis]",
                            "terseLabel":  "Segments [Axis]"
                            }
                        }
                    },
                "localname":  "StatementBusinessSegmentsAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetNarrativeDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfGoodwillDetails",
                    "http://www.alarm.com/role/SegmentInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementEquityComponentsAxis":  {
                "auth_ref":  [
                    "r44",
                    "r224"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by component of equity.",
                            "label":  "Equity Components [Axis]",
                            "terseLabel":  "Equity Components [Axis]"
                            }
                        }
                    },
                "localname":  "StatementEquityComponentsAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Statement [Line Items]",
                            "terseLabel":  "Statement [Line Items]"
                            }
                        }
                    },
                "localname":  "StatementLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity",
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementOfCashFlowsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Statement of Cash Flows [Abstract]"
                            }
                        }
                    },
                "localname":  "StatementOfCashFlowsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementOfFinancialPositionAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Statement of Financial Position [Abstract]"
                            }
                        }
                    },
                "localname":  "StatementOfFinancialPositionAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementOfStockholdersEquityAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Statement of Stockholders' Equity [Abstract]"
                            }
                        }
                    },
                "localname":  "StatementOfStockholdersEquityAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementTable":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule reflecting a Statement of Income, Statement of Cash Flows, Statement of Financial Position, Statement of Shareholders' Equity and Other Comprehensive Income, or other statement as needed.",
                            "label":  "Statement [Table]",
                            "terseLabel":  "Statement [Table]"
                            }
                        }
                    },
                "localname":  "StatementTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity",
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation":  {
                "auth_ref":  [
                    "r17",
                    "r18",
                    "r224",
                    "r229"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number, after forfeiture, of shares or units issued under share-based payment arrangement.  Excludes shares or units issued under employee stock ownership plan (ESOP).",
                            "label":  "Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture",
                            "terseLabel":  "Common stock issued in connection with equity-based plans (in shares)"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodSharesShareBasedCompensation",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised":  {
                "auth_ref":  [
                    "r17",
                    "r18",
                    "r224",
                    "r229",
                    "r254"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of share options (or share units) exercised during the current period.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period",
                            "terseLabel":  "Stock options exercised (in shares)"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodSharesStockOptionsExercised",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation":  {
                "auth_ref":  [
                    "r17",
                    "r18",
                    "r229",
                    "r251",
                    "r257"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Value, after forfeiture, of shares issued under share-based payment arrangement.  Excludes employee stock ownership plan (ESOP).",
                            "label":  "Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture",
                            "terseLabel":  "Common stock issued in connection with equity-based plans"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodValueShareBasedCompensation",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount remaining of a stock repurchase plan authorized.",
                            "label":  "Stock Repurchase Program, Remaining Authorized Repurchase Amount",
                            "terseLabel":  "Authorized repurchase amount"
                            }
                        }
                    },
                "localname":  "StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StockRepurchasedDuringPeriodShares":  {
                "auth_ref":  [
                    "r17",
                    "r18",
                    "r224",
                    "r229"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of shares that have been repurchased during the period and have not been retired and are not held in treasury.  Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore.  This element is used when state law does not recognize treasury stock.",
                            "label":  "Stock Repurchased During Period, Shares",
                            "terseLabel":  "Purchases of treasury stock (in shares)"
                            }
                        }
                    },
                "localname":  "StockRepurchasedDuringPeriodShares",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity",
                    "http://www.alarm.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_StockRepurchasedDuringPeriodValue":  {
                "auth_ref":  [
                    "r17",
                    "r18",
                    "r224",
                    "r229"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury.  Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore.  This element is used when state law does not recognize treasury stock.",
                            "label":  "Stock Repurchased During Period, Value",
                            "negatedTerseLabel":  "Purchases of treasury stock",
                            "terseLabel":  "Purchases of treasury stock"
                            }
                        }
                    },
                "localname":  "StockRepurchasedDuringPeriodValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity",
                    "http://www.alarm.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StockholdersEquity":  {
                "auth_ref":  [
                    "r18",
                    "r23",
                    "r24",
                    "r151"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_LiabilitiesAndStockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent.  The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest).  This excludes temporary equity and is sometimes called permanent equity.",
                            "label":  "Stockholders' Equity Attributable to Parent",
                            "periodEndLabel":  "Balance",
                            "periodStartLabel":  "Balance",
                            "totalLabel":  "Total stockholders\u2019 equity"
                            }
                        }
                    },
                "localname":  "StockholdersEquity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets",
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StockholdersEquityAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Stockholders' Equity Attributable to Parent [Abstract]",
                            "terseLabel":  "Stockholders\u2019 equity"
                            }
                        }
                    },
                "localname":  "StockholdersEquityAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StockholdersEquityNoteDisclosureTextBlock":  {
                "auth_ref":  [
                    "r232"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income.  Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.",
                            "label":  "Stockholders' Equity Note Disclosure [Text Block]",
                            "terseLabel":  "Stockholders' Equity"
                            }
                        }
                    },
                "localname":  "StockholdersEquityNoteDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/StockholdersEquity"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_SubsequentEventMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Identifies event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
                            "label":  "Subsequent Event [Member]",
                            "terseLabel":  "Subsequent Event"
                            }
                        }
                    },
                "localname":  "SubsequentEventMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_SubsequentEventTypeAxis":  {
                "auth_ref":  [
                    "r357"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
                            "label":  "Subsequent Event Type [Axis]",
                            "terseLabel":  "Subsequent Event Type [Axis]"
                            }
                        }
                    },
                "localname":  "SubsequentEventTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SubsequentEventTypeDomain":  {
                "auth_ref":  [
                    "r357"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
                            "label":  "Subsequent Event Type [Domain]",
                            "terseLabel":  "Subsequent Event Type [Domain]"
                            }
                        }
                    },
                "localname":  "SubsequentEventTypeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/OtherAssetsPatentLicensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_TaxCreditCarryforwardAxis":  {
                "auth_ref":  [
                    "r280"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by specific tax credit related to an unused tax credit.",
                            "label":  "Tax Credit Carryforward [Axis]",
                            "terseLabel":  "Tax Credit Carryforward [Axis]"
                            }
                        }
                    },
                "localname":  "TaxCreditCarryforwardAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/IncomeTaxesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_TaxCreditCarryforwardNameDomain":  {
                "auth_ref":  [
                    "r280"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The name of the tax credit carryforward.",
                            "label":  "Tax Credit Carryforward, Name [Domain]",
                            "terseLabel":  "Tax Credit Carryforward, Name [Domain]"
                            }
                        }
                    },
                "localname":  "TaxCreditCarryforwardNameDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/IncomeTaxesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_TemporaryEquityNetIncome":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The portion of net income or loss attributable to temporary equity interest.",
                            "label":  "Temporary Equity, Net Income",
                            "terseLabel":  "Net income / (loss) attributable to common stockholders"
                            }
                        }
                    },
                "localname":  "TemporaryEquityNetIncome",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_TradeNamesMember":  {
                "auth_ref":  [
                    "r293"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Rights acquired through registration of a business name to gain or protect exclusive use thereof.",
                            "label":  "Trade Names [Member]",
                            "terseLabel":  "Trade Name"
                            }
                        }
                    },
                "localname":  "TradeNamesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/AcquisitionsAcquisitionOfBusinessDetails",
                    "http://www.alarm.com/role/AcquisitionsOpeneyeConsiderationPaidAndEstimatedFairValueOfAssetsAcquiredDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfNetCarryingAmountOfIntangibleAssetsDetails",
                    "http://www.alarm.com/role/GoodwillAndIntangibleAssetsNetScheduleOfWeightedAverageRemainingLifeAndCarryingValueOfFiniteLivedIntangibleAssetsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_TreasuryStockMember":  {
                "auth_ref":  [
                    "r43",
                    "r230"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Shares of an entity that have been repurchased by the entity.  This stock has no voting rights and receives no dividends.  Note that treasury stock may be recorded at its total cost or separately as par (or stated) value and additional paid in capital.  Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer.  Classified within temporary equity if redemption is outside the control of the issuer.",
                            "label":  "Treasury Stock [Member]",
                            "terseLabel":  "Treasury Stock"
                            }
                        }
                    },
                "localname":  "TreasuryStockMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_TreasuryStockShares":  {
                "auth_ref":  [
                    "r43",
                    "r230"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date.  This stock has no voting rights and receives no dividends.",
                            "label":  "Treasury Stock, Shares",
                            "terseLabel":  "Treasury stock, shares repurchased (in shares)"
                            }
                        }
                    },
                "localname":  "TreasuryStockShares",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_TreasuryStockValue":  {
                "auth_ref":  [
                    "r43",
                    "r230",
                    "r231"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount allocated to treasury stock.  Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.",
                            "label":  "Treasury Stock, Value",
                            "negatedTerseLabel":  "Treasury stock, at cost; 147,153 and 0 shares as of March 31, 2020 and December 31, 2019, respectively."
                            }
                        }
                    },
                "localname":  "TreasuryStockValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued":  {
                "auth_ref":  [
                    "r273"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.",
                            "label":  "Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued",
                            "terseLabel":  "Accrued interest and penalties related to unrecognized tax benefits"
                            }
                        }
                    },
                "localname":  "UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/IncomeTaxesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease":  {
                "auth_ref":  [
                    "r274"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.",
                            "label":  "Unrecognized Tax Benefits, Period Increase (Decrease)",
                            "terseLabel":  "Unrecognized tax benefits"
                            }
                        }
                    },
                "localname":  "UnrecognizedTaxBenefitsPeriodIncreaseDecrease",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/IncomeTaxesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_UseOfEstimates":  {
                "auth_ref":  [
                    "r109",
                    "r110",
                    "r111",
                    "r112",
                    "r118",
                    "r119",
                    "r120"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.",
                            "label":  "Use of Estimates, Policy [Policy Text Block]",
                            "terseLabel":  "Use of Estimates"
                            }
                        }
                    },
                "localname":  "UseOfEstimates",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_VariableRateAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of variable rate.",
                            "label":  "Variable Rate [Axis]",
                            "terseLabel":  "Variable Rate [Axis]"
                            }
                        }
                    },
                "localname":  "VariableRateAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_VariableRateDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Interest rate that fluctuates over time as a result of an underlying benchmark interest rate or index.",
                            "label":  "Variable Rate [Domain]",
                            "terseLabel":  "Variable Rate [Domain]"
                            }
                        }
                    },
                "localname":  "VariableRateDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/DebtCommitmentsAndContingenciesDebtDetails",
                    "http://www.alarm.com/role/OtherAssetsLoanToDistributionPartnerAndPrepaidExpensesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding":  {
                "auth_ref":  [
                    "r95",
                    "r100"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.",
                            "label":  "Weighted Average Number of Shares Outstanding, Diluted",
                            "terseLabel":  "Diluted (in shares)",
                            "totalLabel":  "Weighted average common shares outstanding - diluted (in shares)"
                            }
                        }
                    },
                "localname":  "WeightedAverageNumberOfDilutedSharesOutstanding",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic":  {
                "auth_ref":  [
                    "r93",
                    "r100"
                    ],
                "calculation":  {
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
                        "weight":  1.0
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.",
                            "label":  "Weighted Average Number of Shares Outstanding, Basic",
                            "terseLabel":  "Weighted average common shares outstanding - basic (in shares)",
                            "verboseLabel":  "Basic (in shares)"
                            }
                        }
                    },
                "localname":  "WeightedAverageNumberOfSharesOutstandingBasic",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations",
                    "http://www.alarm.com/role/EarningsPerShareComponentsOfBasicAndDilutedEpsDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Weighted Average Number of Shares Outstanding Reconciliation [Abstract]",
                            "terseLabel":  "Weighted average common shares outstanding:"
                            }
                        }
                    },
                "localname":  "WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.alarm.com/role/CondensedConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "stringItemType"
                }
            },
        "unitCount":  8
        }
    },
"std_ref":  {
    "r0":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=6359566&loc=d3e326-107755"
        },
    "r1":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(d)",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760"
        },
    "r10":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6935-107765"
        },
    "r100":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
        },
    "r101":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
        },
    "r102":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
        },
    "r103":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "52",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117327953&loc=d3e4984-109258"
        },
    "r104":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/topic&trid=2144383"
        },
    "r105":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "270",
        "URI":  "http://asc.fasb.org/extlink&oid=116846552&loc=d3e725-108305"
        },
    "r106":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "270",
        "URI":  "http://asc.fasb.org/extlink&oid=116846552&loc=d3e765-108305"
        },
    "r107":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.10-01.(b)(6))",
        "Topic":  "270",
        "URI":  "http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699"
        },
    "r108":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
        },
    "r109":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
        },
    "r11":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766"
        },
    "r110":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
        },
    "r111":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6161-108592"
        },
    "r112":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6191-108592"
        },
    "r113":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592"
        },
    "r114":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "18",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592"
        },
    "r115":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "18",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592"
        },
    "r116":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592"
        },
    "r117":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "21",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6442-108592"
        },
    "r118":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6061-108592"
        },
    "r119":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6132-108592"
        },
    "r12":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(13))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r120":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6143-108592"
        },
    "r121":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/topic&trid=2134479"
        },
    "r122":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8615-108599"
        },
    "r123":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "14",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8654-108599"
        },
    "r124":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8657-108599"
        },
    "r125":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8660-108599"
        },
    "r126":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "17",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8663-108599"
        },
    "r127":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "18",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8672-108599"
        },
    "r128":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "21",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599"
        },
    "r129":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "22",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
        },
    "r13":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(14))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r130":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "22",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(h)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
        },
    "r131":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "22",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
        },
    "r132":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "25",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599"
        },
    "r133":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "25",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599"
        },
    "r134":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "30",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599"
        },
    "r135":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "32",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599"
        },
    "r136":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "32",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599"
        },
    "r137":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "40",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9031-108599"
        },
    "r138":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "42",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9054-108599"
        },
    "r139":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/topic&trid=2134510"
        },
    "r14":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(19))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r140":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522"
        },
    "r141":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4531-111522"
        },
    "r142":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11B",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524"
        },
    "r143":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11B",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(3)",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524"
        },
    "r144":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11B",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524"
        },
    "r145":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "29",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953659-111524"
        },
    "r146":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5066-111524"
        },
    "r147":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524"
        },
    "r148":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524"
        },
    "r149":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524"
        },
    "r15":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(20))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r150":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953401-111524"
        },
    "r151":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB Topic 4.E)",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707"
        },
    "r152":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/subtopic&trid=2196772"
        },
    "r153":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562"
        },
    "r154":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "10",
        "Topic":  "323",
        "URI":  "http://asc.fasb.org/extlink&oid=117311354&loc=d3e32014-111567"
        },
    "r155":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "323",
        "URI":  "http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570"
        },
    "r156":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)(1)",
        "Topic":  "323",
        "URI":  "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571"
        },
    "r157":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446"
        },
    "r158":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919244-210447"
        },
    "r159":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(a)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
        },
    "r16":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(22))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r160":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
        },
    "r161":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(d)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
        },
    "r162":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(f)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
        },
    "r163":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
        },
    "r164":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "14",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919253-210447"
        },
    "r165":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447"
        },
    "r166":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(c)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447"
        },
    "r167":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(d)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447"
        },
    "r168":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447"
        },
    "r169":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "17",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919260-210447"
        },
    "r17":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(28))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r170":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "21",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919272-210447"
        },
    "r171":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447"
        },
    "r172":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447"
        },
    "r173":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447"
        },
    "r174":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955255&loc=SL82921833-210448"
        },
    "r175":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955255&loc=SL82921835-210448"
        },
    "r176":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "79",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448"
        },
    "r177":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "80",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448"
        },
    "r178":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922895-210455"
        },
    "r179":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "35",
        "SubTopic":  "10",
        "Topic":  "330",
        "URI":  "http://asc.fasb.org/extlink&oid=116846819&loc=d3e3927-108312"
        },
    "r18":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(29))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r180":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB Topic 5.BB)",
        "Topic":  "330",
        "URI":  "http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729"
        },
    "r181":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "330",
        "URI":  "http://asc.fasb.org/topic&trid=2126998"
        },
    "r182":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "40",
        "Subparagraph":  "(a)",
        "Topic":  "340",
        "URI":  "http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054"
        },
    "r183":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "40",
        "Subparagraph":  "(b)",
        "Topic":  "340",
        "URI":  "http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054"
        },
    "r184":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266"
        },
    "r185":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266"
        },
    "r186":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975"
        },
    "r187":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
        },
    "r188":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(e)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
        },
    "r189":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
        },
    "r19":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(3)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r190":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267"
        },
    "r191":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267"
        },
    "r192":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274"
        },
    "r193":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
        },
    "r194":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)(1)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
        },
    "r195":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)(3)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
        },
    "r196":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(d)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
        },
    "r197":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
        },
    "r198":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)(1)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
        },
    "r199":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)(2)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
        },
    "r2":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
        },
    "r20":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(3))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r200":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(d)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
        },
    "r201":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/topic&trid=2144416"
        },
    "r202":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228"
        },
    "r203":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
        },
    "r204":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
        },
    "r205":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230"
        },
    "r206":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230"
        },
    "r207":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(f)",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230"
        },
    "r208":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "420",
        "URI":  "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869"
        },
    "r209":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB Topic 5.P.4(d))",
        "Topic":  "420",
        "URI":  "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747"
        },
    "r21":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(30)(a)(1))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r210":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349"
        },
    "r211":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14615-108349"
        },
    "r212":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14394-108349"
        },
    "r213":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349"
        },
    "r214":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14453-108349"
        },
    "r215":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14472-108349"
        },
    "r216":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14557-108349"
        },
    "r217":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "460",
        "URI":  "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12021-110248"
        },
    "r218":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "460",
        "URI":  "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12053-110248"
        },
    "r219":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "470",
        "URI":  "http://asc.fasb.org/extlink&oid=6802200&loc=SL6230698-112601"
        },
    "r22":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(30)(a)(3))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r220":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3A",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(12)(c)",
        "Topic":  "480",
        "URI":  "http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764"
        },
    "r221":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3A",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(16)(c)",
        "Topic":  "480",
        "URI":  "http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764"
        },
    "r222":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3A",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "14",
        "Topic":  "480",
        "URI":  "http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764"
        },
    "r223":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3A",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "15",
        "Topic":  "480",
        "URI":  "http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764"
        },
    "r224":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644"
        },
    "r225":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644"
        },
    "r226":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644"
        },
    "r227":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644"
        },
    "r228":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644"
        },
    "r229":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.3-04)",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770"
        },
    "r23":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(30))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r230":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655"
        },
    "r231":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656"
        },
    "r232":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/topic&trid=2208762"
        },
    "r233":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044"
        },
    "r234":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044"
        },
    "r235":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044"
        },
    "r236":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045"
        },
    "r237":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045"
        },
    "r238":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045"
        },
    "r239":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045"
        },
    "r24":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(31))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r240":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045"
        },
    "r241":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "91",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046"
        },
    "r242":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "91",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046"
        },
    "r243":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/topic&trid=49130388"
        },
    "r244":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(d)(ii)",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
        },
    "r245":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(d)(iv)(01)",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
        },
    "r246":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(n)",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
        },
    "r247":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "17",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921"
        },
    "r248":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "35",
        "SubTopic":  "10",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116855982&loc=d3e4534-113899"
        },
    "r249":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
        },
    "r25":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(32))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r250":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
        },
    "r251":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
        },
    "r252":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
        },
    "r253":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a),(g)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r254":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)(iv)(2)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r255":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(2)(iii)(1)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r256":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(2)(iii)(2)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r257":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)(1)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r258":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(g)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r259":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(h)(1)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r26":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(6)(a)(1))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r260":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(h)(1)(i)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r261":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r262":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901"
        },
    "r263":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB Topic 14.F)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809"
        },
    "r264":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11149-113907"
        },
    "r265":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11178-113907"
        },
    "r266":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/topic&trid=2228938"
        },
    "r267":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "730",
        "URI":  "http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373"
        },
    "r268":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "25",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116821951&loc=d3e32247-109318"
        },
    "r269":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116821951&loc=d3e32280-109318"
        },
    "r27":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(6)(a)(4))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r270":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116821951&loc=d3e31931-109318"
        },
    "r271":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319"
        },
    "r272":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319"
        },
    "r273":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319"
        },
    "r274":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319"
        },
    "r275":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "17",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319"
        },
    "r276":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "19",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319"
        },
    "r277":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319"
        },
    "r278":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319"
        },
    "r279":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32847-109319"
        },
    "r28":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(6)(a))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r280":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319"
        },
    "r281":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319"
        },
    "r282":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB Topic 6.I.7)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817"
        },
    "r283":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(a)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324"
        },
    "r284":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "05",
        "SubTopic":  "30",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=65884525&loc=d3e40913-109327"
        },
    "r285":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/topic&trid=2144680"
        },
    "r286":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
        },
    "r287":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
        },
    "r288":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1486-128463"
        },
    "r289":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "37",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464"
        },
    "r29":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(6)(b))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r290":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(c)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472"
        },
    "r291":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(e)(1)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472"
        },
    "r292":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(c)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=116869197&loc=SL65897772-128472"
        },
    "r293":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "14",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Subparagraph":  "(a)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=77890550&loc=d3e5263-128473"
        },
    "r294":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Subparagraph":  "(c)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=77890550&loc=d3e5333-128473"
        },
    "r295":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "38",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=77890550&loc=d3e5504-128473"
        },
    "r296":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "30",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476"
        },
    "r297":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "30",
        "SubTopic":  "30",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477"
        },
    "r298":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "30",
        "SubTopic":  "30",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477"
        },
    "r299":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "35",
        "SubTopic":  "30",
        "Subparagraph":  "(b)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478"
        },
    "r3":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
        },
    "r30":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(6)(c))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r300":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(b)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479"
        },
    "r301":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(b)(1)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479"
        },
    "r302":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(c)(1)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479"
        },
    "r303":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(c)(3)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479"
        },
    "r304":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)(1)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479"
        },
    "r305":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/topic&trid=2303972"
        },
    "r306":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "19",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683"
        },
    "r307":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)(1)",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
        },
    "r308":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
        },
    "r309":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4J",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=116874947&loc=SL4591551-111686"
        },
    "r31":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.1)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r310":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4K",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=116874947&loc=SL4591552-111686"
        },
    "r311":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "815",
        "URI":  "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959"
        },
    "r312":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4B",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "815",
        "URI":  "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
        },
    "r313":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "182",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "815",
        "URI":  "http://asc.fasb.org/extlink&oid=116861445&loc=SL5629052-113961"
        },
    "r314":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6A",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "20",
        "Topic":  "815",
        "URI":  "http://asc.fasb.org/extlink&oid=118875152&loc=SL5864739-113975"
        },
    "r315":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r316":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r317":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(bb)",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r318":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(bbb)",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r319":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(bbb)(1)",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r32":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.12)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r320":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(bbb)(2)",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r321":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r322":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r323":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r324":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258"
        },
    "r325":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258"
        },
    "r326":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611"
        },
    "r327":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13476-108611"
        },
    "r328":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611"
        },
    "r329":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "21",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611"
        },
    "r33":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.17)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r330":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "21",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611"
        },
    "r331":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "230",
        "Topic":  "830",
        "URI":  "http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906"
        },
    "r332":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "835",
        "URI":  "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399"
        },
    "r333":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "835",
        "URI":  "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399"
        },
    "r334":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "835",
        "URI":  "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399"
        },
    "r335":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "30",
        "Topic":  "835",
        "URI":  "http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400"
        },
    "r336":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(a)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977"
        },
    "r337":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977"
        },
    "r338":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977"
        },
    "r339":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(c)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977"
        },
    "r34":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.19(a))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r340":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(a)(3)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980"
        },
    "r341":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(c)(3)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980"
        },
    "r342":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980"
        },
    "r343":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
        },
    "r344":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(g)(1)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
        },
    "r345":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(g)(2)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
        },
    "r346":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(g)(3)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
        },
    "r347":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980"
        },
    "r348":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "53",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971"
        },
    "r349":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "SubTopic":  "20",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/subtopic&trid=77888251"
        },
    "r35":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.19(b),22(b))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r350":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
        },
    "r351":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
        },
    "r352":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864"
        },
    "r353":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864"
        },
    "r354":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39678-107864"
        },
    "r355":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864"
        },
    "r356":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/topic&trid=2122745"
        },
    "r357":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "855",
        "URI":  "http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662"
        },
    "r358":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(bb)",
        "Topic":  "860",
        "URI":  "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
        },
    "r359":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(bb)(1)",
        "Topic":  "860",
        "URI":  "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
        },
    "r36":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.19-26)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r360":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(bb)(2)",
        "Topic":  "860",
        "URI":  "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
        },
    "r361":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(bb)(3)",
        "Topic":  "860",
        "URI":  "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
        },
    "r362":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "340",
        "Topic":  "928",
        "URI":  "http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004"
        },
    "r363":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(a)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61929-109447"
        },
    "r364":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(b)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61929-109447"
        },
    "r365":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(a)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62059-109447"
        },
    "r366":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(b)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62059-109447"
        },
    "r367":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(a)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62395-109447"
        },
    "r368":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(b)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62395-109447"
        },
    "r369":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "33",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(a)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447"
        },
    "r37":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.20)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r370":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "33",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(b)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447"
        },
    "r371":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "35A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(a)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447"
        },
    "r372":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "35A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(b)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447"
        },
    "r373":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(c)(1)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61872-109447"
        },
    "r374":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(c)(2)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61872-109447"
        },
    "r375":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "20",
        "Topic":  "940",
        "URI":  "http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953"
        },
    "r376":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(11))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r377":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(13))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r378":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(16))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r379":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(23))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r38":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.21)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r380":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(7)(d))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r381":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(7))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r382":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03.10)",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r383":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03.17)",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r384":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.9-04(11))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r385":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.9-04(15))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r386":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.9-04(22))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r387":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.9-04(23))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r388":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.9-04.8)",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r389":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "470",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823"
        },
    "r39":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.22(a)(1))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r390":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(16))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r391":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(12))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r392":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(23)(a)(4))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r393":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(25))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r394":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(8))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r395":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03.(a),19)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r396":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03.10)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r397":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04(18))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r398":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04(19))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r399":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04(8))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r4":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
        },
    "r40":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.22)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r400":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4H",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "40",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116884468&loc=SL65671331-158438"
        },
    "r401":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13H",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "40",
        "Subparagraph":  "(a)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=117419784&loc=SL117783719-158441"
        },
    "r402":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13H",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "40",
        "Subparagraph":  "(c)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=117419784&loc=SL117783719-158441"
        },
    "r403":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1B",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "825",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=99380617&loc=SL75241803-196195"
        },
    "r404":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "740",
        "Topic":  "954",
        "URI":  "http://asc.fasb.org/extlink&oid=6491622&loc=d3e9504-115650"
        },
    "r405":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "220",
        "Subparagraph":  "(a)",
        "Topic":  "958",
        "URI":  "http://asc.fasb.org/extlink&oid=114873921&loc=SL114875236-224282"
        },
    "r406":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "360",
        "Subparagraph":  "(SX 210.12-28(Footnote 4))",
        "Topic":  "970",
        "URI":  "http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024"
        },
    "r407":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "985",
        "URI":  "http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756"
        },
    "r408":  {
        "Name":  "Exchange Act",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "b"
        },
    "r409":  {
        "Name":  "Exchange Act",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "d1-1"
        },
    "r41":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.24)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r410":  {
        "Name":  "Form 10-Q",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "13",
        "Subsection":  "a-13"
        },
    "r411":  {
        "Name":  "Forms 10-K, 10-Q, 20-F",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "13",
        "Subsection":  "a-1-"
        },
    "r412":  {
        "Name":  "Regulation 12B",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "b-2"
        },
    "r413":  {
        "Name":  "Regulation S-T",
        "Number":  "232",
        "Publisher":  "SEC",
        "Section":  "405"
        },
    "r42":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.25)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r43":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.29,30)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r44":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.29-31)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r45":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.3(a),(b))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r46":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.3,4)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r47":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.6(a))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r48":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.8)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r49":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.9)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r5":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(e)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
        },
    "r50":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
        },
    "r51":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1B",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580"
        },
    "r52":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116657188&loc=SL116659661-227067"
        },
    "r53":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(10))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r54":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(20))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r55":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(21))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r56":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(4))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r57":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(5))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r58":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(8))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r59":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(b)(2))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r6":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
        },
    "r60":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.19)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r61":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.2(a),(d))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r62":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.4)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r63":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.9)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r64":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585"
        },
    "r65":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
        },
    "r66":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
        },
    "r67":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
        },
    "r68":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "14",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585"
        },
    "r69":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "14",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585"
        },
    "r7":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6801-107765"
        },
    "r70":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
        },
    "r71":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
        },
    "r72":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3000-108585"
        },
    "r73":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "24",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585"
        },
    "r74":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "25",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
        },
    "r75":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
        },
    "r76":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
        },
    "r77":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
        },
    "r78":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585"
        },
    "r79":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586"
        },
    "r8":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6904-107765"
        },
    "r80":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790"
        },
    "r81":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(e)",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18823-107790"
        },
    "r82":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(f)",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18823-107790"
        },
    "r83":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08(h))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r84":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08(k))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r85":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08.(e),(f))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r86":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08.(f))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r87":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08.(h)(2))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r88":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08.(k)(1))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r89":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/topic&trid=2122369"
        },
    "r9":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6911-107765"
        },
    "r90":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "250",
        "URI":  "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
        },
    "r91":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "250",
        "URI":  "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794"
        },
    "r92":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "250",
        "URI":  "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794"
        },
    "r93":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256"
        },
    "r94":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1377-109256"
        },
    "r95":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256"
        },
    "r96":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1252-109256"
        },
    "r97":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1500-109256"
        },
    "r98":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "60B",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=SL5780133-109256"
        },
    "r99":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256"
        }
    },
"version":  "2.1"
}

4 Subsequent Filings that Reference this Filing

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 2/22/24  Alarm.com Holdings, Inc.          10-K       12/31/23  141:14M
 2/24/23  Alarm.com Holdings, Inc.          10-K       12/31/22  146:16M
 2/24/22  Alarm.com Holdings, Inc.          10-K       12/31/21  152:17M
 2/25/21  Alarm.com Holdings, Inc.          10-K       12/31/20  147:16M
↑Top
Filing Submission 0001459200-20-000012   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)
Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
About — Privacy — Redactions — Help — Sat., May 11, 7:31:45.4am ET