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| <link:definition> 111 - Disclosure - Summary of significant accounting policies (Tables) </link:definition> |
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| <link:definition> 112 - Disclosure - Share-based Compensation (Tables) </link:definition> |
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| <link:definition> 113 - Disclosure - Summary of significant accounting policies - Company's Revenues (Detail) </link:definition> |
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| <link:definition> 114 - Disclosure - Summary of significant accounting policies - Reconciliation of Shares Used to Determine Net Income per Share (Detail) </link:definition> |
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| <link:definition> 116 - Disclosure - Share-based compensation - Weighted Average Assumptions Used in Determining Fair Value of Share Based Awards at Grant Date by Using Black-Scholes Option Pricing Model (Detail) </link:definition> |
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| <link:definition> 117 - Disclosure - Share-based compensation - Summary of Status of Company's Stock Option Plan (Detail) </link:definition> |
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| <link:definition> 118 - Disclosure - Share-based compensation - Weighted Average Contractual Life and Exercise Price (Detail) </link:definition> |
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| <link:definition> 119 - Disclosure - Share-based compensation - Intrinsic Value (Detail) </link:definition> |
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| <link:definition> 120 - Disclosure - Share-Based Compensation - Additional Information (Detail) </link:definition> |
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| <link:definition> 121 - Disclosure - Debt - Additional Information (Detail) </link:definition> |
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| <link:definition> 122 - Disclosure - Acquisitions - Additional Information (Detail) </link:definition> |
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| <element name="BusinessAcquisitionPurchasePriceAllocationDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="hdsn_BusinessAcquisitionPurchasePriceAllocationDescription"/> |
| <element name="NoncashOrParTnoncashDeferredAcquisitionConsideration" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="hdsn_NoncashOrParTnoncashDeferredAcquisitionConsideration"/> |
| <element name="ProductionOrImportationOfHcfc" type="num:massItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="hdsn_ProductionOrImportationOfHcfc"/> |
| <element name="DebtDisclosureLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="hdsn_DebtDisclosureLineItems"/> |
| <element name="AmendmentDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="hdsn_AmendmentDomain"/> |
| <element name="SecondAmendmentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="hdsn_SecondAmendmentMember"/> |
| <element name="FourthAmendmentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="hdsn_FourthAmendmentMember"/> |
| </schema> |