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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Significant Accounting Policies [Line Items] |  |
Entity Incorporation Date Of Incorporation | Jan. 11, 1991 |
Concentration risk, customer | two customers each accounted for 10% or more of the Companys revenues | two customers each accounted for 10% or more of the Companys revenues
Aggregate percentage of revenue the from customers accounted for more than 10% | 25.00%us-gaap_ConcentrationRiskPercentage1 | 23.00%us-gaap_ConcentrationRiskPercentage1
Deferred tax asset | $ 6,428,000 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 5,570,000 us-gaap_DeferredTaxAssetsLiabilitiesNet
Operating loss carryforwards, limitations on use | Approximately $8,000,000 of the Companys $16,000,000 of NOLs are subject to annual limitations of $1,300,000 |
Options and warrants excluded from the calculation of diluted shares | 4,449,624 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 3,760,161 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Production and importation permission description | 22 million pounds in 2015 and reduce by approximately 4.5 million pounds each year and end at zero in 2020 |
Lower Of Cost Or Market Adjustment Amount |  | 14,700,000 hdsn_LowerOfCostOrMarketAdjustmentAmount
Customer |  |
Significant Accounting Policies [Line Items] |  |
Accounts receivable, net | $ 688,000 us-gaap_AccountsReceivableNet / us-gaap_MajorCustomersAxis = hdsn_CustomerMember | $ 344,000 us-gaap_AccountsReceivableNet / us-gaap_MajorCustomersAxis = hdsn_CustomerMember

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- Definition For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.9) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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