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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating activities:    
Net loss $ (20,570,000)us-gaap_NetIncomeLoss $ (17,538,000)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used for operating activities:    
Depreciation and amortization 152,000us-gaap_DepreciationAndAmortization 114,000us-gaap_DepreciationAndAmortization
Stock-based compensation expense 2,551,000us-gaap_ShareBasedCompensation 2,969,000us-gaap_ShareBasedCompensation
Amortization of Debt Discount (Premium) 151,000us-gaap_AmortizationOfDebtDiscountPremium 139,000us-gaap_AmortizationOfDebtDiscountPremium
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 112,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,624,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (166,000)us-gaap_IncreaseDecreaseInAccountsPayable 2,238,000us-gaap_IncreaseDecreaseInAccountsPayable
Accrued clinical liabilities (293,000)hrtx_IncreaseDecreaseInClinicalLiabilities (1,029,000)hrtx_IncreaseDecreaseInClinicalLiabilities
Accrued payroll and employee-related liabilities (1,075,000)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities (1,254,000)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Other accrued expenses (531,000)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities 272,000us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Net cash used for operating activities (19,669,000)us-gaap_NetCashProvidedByUsedInOperatingActivities (15,713,000)us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities:    
Purchases of property and equipment (328,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (57,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used for investing activities (328,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (57,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities:    
Proceeds from stock option exercises 2,878,000us-gaap_ProceedsFromStockOptionsExercised 958,000us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by financing activities 2,878,000us-gaap_NetCashProvidedByUsedInFinancingActivities 958,000us-gaap_NetCashProvidedByUsedInFinancingActivities
Net decrease in cash and cash equivalents (17,119,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (14,812,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 72,675,000us-gaap_CashAndCashEquivalentsAtCarryingValue 72,287,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 55,556,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 57,475,000us-gaap_CashAndCashEquivalentsAtCarryingValue