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Intrinsic Value (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items] |
Options outstanding | $ 5,907,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Options vested in 2014 | 535,000 hdsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalIntrinsicValue
Options exercised in 2014 | $ 793,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

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- Details
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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Options, Vested in Period, Total Intrinsic Value + References No definition available. + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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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