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Share-Based Compensation - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Sep. 10, 2004 | Aug. 27, 2008 | Sep. 17, 2014 | Aug. 19, 1999
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Share based compensation expense | $ 708,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 122,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |
Issuance of stock option to purchase stock | 6,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized |  |  |  |  |
Common stock reserved for issuance | 4,466,233 us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance |  |  |  |  |
Stock option awards vesting period | 2 years |  |  |  |  |
Options granted | 1,055,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 173,354 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |  |  |
Unrecognized compensation cost related to bon-vested | 107,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |  |
Intrinsic value of options exercised |  | $ 2,816,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |  |  |
Maximum |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share based payment award options granted contractual term | 10 years |  |  |  |  |
Minimum |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share based payment award options granted contractual term | 3 years |  |  |  |  |
2004 Stock Incentive Plan |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Common stock reserved for issuance |  |  | 2,500,000 us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance / us-gaap_PlanNameAxis = hdsn_TwoThousandAndFourStockIncentivePlanMember |  |  |
Plan expiration date |  |  | Sep. 10, 2014 |  |  |
2008 Stock Incentive Plan |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Common stock reserved for issuance |  |  |  | 3,000,000 us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance / us-gaap_PlanNameAxis = hdsn_TwoThousandAndEightStockIncentivePlanMember |  |
Plan expiration date |  |  |  | Aug. 27, 2018 |  |
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock |  |  |  | 110.00%hdsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageFromFairMarketPrice / us-gaap_PlanNameAxis = hdsn_TwoThousandAndEightStockIncentivePlanMember |  |
2014 Stock Incentive Plan |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  | 3,000,000 us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance / us-gaap_PlanNameAxis = hdsn_TwoThousandAndFourteenStockIncentivePlanMember |
Plan expiration date |  |  |  |  | Sep. 17, 2024 |
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock |  |  |  |  | 110.00%hdsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageFromFairMarketPrice / us-gaap_PlanNameAxis = hdsn_TwoThousandAndFourteenStockIncentivePlanMember |
2014 Stock Incentive Plan | Maximum |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Expiration period of option awards |  |  |  |  | 10 years |
2014 Stock Incentive Plan | Minimum |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Expiration period of option awards |  |  |  |  | 5 years |
2008 Stock Incentive Plan | Maximum |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Expiration period of option awards |  |  |  | 10 years |  |
2008 Stock Incentive Plan | Minimum |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Expiration period of option awards |  |  |  | 5 years |  |
1997 Employee Stock Option Plan |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  |  | 2,000,000 us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = hdsn_StockOptionPlanNineteenNinetySevenMember
Plan expiration date |  |  |  |  |  | Jun. 11, 2007

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- Definition Share based compensation arrangement by share based payment award percentage from fair market price. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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