XML 25 R47.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Commitments and contingencies - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Commitments and Contingencies [Line Items] |  |
Operating Leases, Rent Expense | $ 830,000 us-gaap_LeaseAndRentalExpense | $ 650,000 us-gaap_LeaseAndRentalExpense
Remediation Costs Incurred | 53,000 hdsn_RemediationCostsIncurred | 100,000 hdsn_RemediationCostsIncurred
Officers' Compensation | 288,500 us-gaap_OfficersCompensation |
Insurance Policy Amount | $ 1,000,000 hdsn_InsurancePolicyAmount |

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

X
- Definition Represents insurance policy amount during the period. + References No definition available. + Details
Name: | hdsn_InsurancePolicyAmount
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element refers to remediation costs incurred. + References No definition available. + Details
Name: | hdsn_RemediationCostsIncurred
Namespace Prefix: | hdsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Expenditures for salaries of officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_OfficersCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration