XML 73 R59.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Share-Based Compensation - Intrinsic Value (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items] |  |  |
Intrinsic value of options vested | $ 4,843,774 | $ 5,000 | $ 535,000
Intrinsic value of options exercised | $ 1,777,476 | $ 1,309,000 | $ 793,000

X
- Definition Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items] + References No definition available. + Details
Name: | hdsn_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardPerformanceOptionsLineItems
Namespace Prefix: | hdsn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share Based Compensation Arrangement by Share Based Payment Award, Options, Vested in Period, Total Intrinsic Value + References No definition available. + Details
Name: | hdsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalIntrinsicValue
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration