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Condensed Consolidated Balance Sheets (Current Period Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 55,556us-gaap_CashAndCashEquivalentsAtCarryingValue $ 72,675us-gaap_CashAndCashEquivalentsAtCarryingValue
Prepaid expenses and other current assets 945us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,057us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 56,501us-gaap_AssetsCurrent 73,732us-gaap_AssetsCurrent
Property and equipment, net 2,996us-gaap_PropertyPlantAndEquipmentNet 2,820us-gaap_PropertyPlantAndEquipmentNet
Other long-term assets 130us-gaap_OtherAssetsNoncurrent 130us-gaap_OtherAssetsNoncurrent
Total assets 59,627us-gaap_Assets 76,682us-gaap_Assets
Current liabilities:    
Accounts payable 2,383us-gaap_AccountsPayableCurrent 2,549us-gaap_AccountsPayableCurrent
Accrued clinical liabilities 3,518hrtx_AccruedClinicalLiabilities 3,811hrtx_AccruedClinicalLiabilities
Accrued payroll and employee-related liabilities 1,656us-gaap_EmployeeRelatedLiabilitiesCurrent 2,731us-gaap_EmployeeRelatedLiabilitiesCurrent
Other accrued expenses 2,320us-gaap_OtherAccruedLiabilitiesCurrent 2,931us-gaap_OtherAccruedLiabilitiesCurrent
Convertible notes payable to related parties, net of discount 1,749hrtx_ConvertibleNotesPayableRelatedPartiesCurrent 1,598hrtx_ConvertibleNotesPayableRelatedPartiesCurrent
Total current liabilities 11,626us-gaap_LiabilitiesCurrent 13,620us-gaap_LiabilitiesCurrent
Stockholders’ equity:    
Common stock 296us-gaap_CommonStockValue 292us-gaap_CommonStockValue
Additional paid-in capital 383,512us-gaap_AdditionalPaidInCapital 378,007us-gaap_AdditionalPaidInCapital
Accumulated deficit (335,807)us-gaap_RetainedEarningsAccumulatedDeficit (315,237)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity 48,001us-gaap_StockholdersEquity 63,062us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity $ 59,627us-gaap_LiabilitiesAndStockholdersEquity $ 76,682us-gaap_LiabilitiesAndStockholdersEquity