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EBITDA Calculation (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014
EBITDA Calculation [Line Items] |
Net (loss) | $ (720,000)hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationNetIncomeLoss
less: income tax benefit | (906,000)hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationIncomeTaxExpenseBenefit
Loss before income taxes | (1,626,000)hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationIncomeLossBeforeIncomeTaxes
add: interest expense | 641,000 hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationInterestExpense
add: depreciation and amortization | 979,000 hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationAdjustments
add: value of share-based payment arrangements | 708,000 hdsn_EarningsBeforeInterestTaxesShareBasedCompensation
Add: other non-cash expense | 414,000 hdsn_EarningsBeforeInterestTaxesOtherNoncashExpense
Earnings before interest, taxes, depreciation, and amortization | $ 1,116,000 hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortization

X
- Definition Earnings before interest taxes depreciation and amortization. + References No definition available. + Details
Name: | hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortization
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Earnings before interest taxes depreciation and amortization adjustments. + References No definition available. + Details
Name: | hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationAdjustments
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Earnings before interest taxes depreciation and amortization income loss before income taxes. + References No definition available. + Details
Name: | hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationIncomeLossBeforeIncomeTaxes
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Earnings before interest taxes depreciation and amortization income tax expense benefit. + References No definition available. + Details
Name: | hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationIncomeTaxExpenseBenefit
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Earnings before interest taxes depreciation and amortization interest expense. + References No definition available. + Details
Name: | hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationInterestExpense
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Earnings before interest taxes depreciation and amortization net income loss. + References No definition available. + Details
Name: | hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortizationNetIncomeLoss
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Earnings before interest taxes other noncash expense. + References No definition available. + Details
Name: | hdsn_EarningsBeforeInterestTaxesOtherNoncashExpense
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Earnings before interest taxes share based compensation. + References No definition available. + Details
Name: | hdsn_EarningsBeforeInterestTaxesShareBasedCompensation
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | hdsn_EbitdaCalculationLineItems
Namespace Prefix: | hdsn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration