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Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 72,675us-gaap_CashAndCashEquivalentsAtCarryingValue $ 72,287us-gaap_CashAndCashEquivalentsAtCarryingValue
Prepaid expenses and other current assets 1,057us-gaap_PrepaidExpenseAndOtherAssetsCurrent 638us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 73,732us-gaap_AssetsCurrent 72,925us-gaap_AssetsCurrent
Property and equipment, net 2,820us-gaap_PropertyPlantAndEquipmentNet 2,882us-gaap_PropertyPlantAndEquipmentNet
Other assets 130us-gaap_OtherAssetsNoncurrent 130us-gaap_OtherAssetsNoncurrent
Total assets 76,682us-gaap_Assets 75,937us-gaap_Assets
Current liabilities:    
Accounts payable 2,549us-gaap_AccountsPayableCurrent 1,264us-gaap_AccountsPayableCurrent
Accrued clinical liabilities 3,811hrtx_AccruedClinicalLiabilities 1,773hrtx_AccruedClinicalLiabilities
Accrued payroll and employee liabilities 2,731us-gaap_EmployeeRelatedLiabilitiesCurrent 2,566us-gaap_EmployeeRelatedLiabilitiesCurrent
Other accrued liabilities 2,931us-gaap_OtherAccruedLiabilitiesCurrent 364us-gaap_OtherAccruedLiabilitiesCurrent
Convertible notes payable to related parties, net of discount 1,598hrtx_ConvertibleNotesPayableRelatedPartiesCurrent 1,025hrtx_ConvertibleNotesPayableRelatedPartiesCurrent
Total current liabilities 13,620us-gaap_LiabilitiesCurrent 6,992us-gaap_LiabilitiesCurrent
Stockholders’ equity:    
Preferred stock, $0.01 par value: 2,500 shares authorized; no shares issued or outstanding at December 31, 2014 and 2013 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $0.01 par value: 75,000 shares authorized; 29,227 and 23,572 shares issued and outstanding at December 31, 2014 and 2013, respectively 292us-gaap_CommonStockValue 237us-gaap_CommonStockValue
Additional paid-in capital 378,007us-gaap_AdditionalPaidInCapital 307,578us-gaap_AdditionalPaidInCapital
Accumulated deficit (315,237)us-gaap_RetainedEarningsAccumulatedDeficit (238,870)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity 63,062us-gaap_StockholdersEquity 68,945us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity $ 76,682us-gaap_LiabilitiesAndStockholdersEquity $ 75,937us-gaap_LiabilitiesAndStockholdersEquity