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Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Compensation $ 909us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent $ 1,806us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent
Professional fees 305us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent 404us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent
Other expenses 275us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent 0us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent
Accrued Alferon production costs 0heb_AccruedProductionCost 123heb_AccruedProductionCost
Total Accrued Expenses $ 1,489us-gaap_AccruedLiabilitiesCurrentAndNoncurrent $ 2,333us-gaap_AccruedLiabilitiesCurrentAndNoncurrent