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Note 6 - Senior Secured Convertible Notes to Related Parties (Details) (USD $)
0 Months Ended 1 Months Ended 12 Months Ended
Jul. 29, 2011
Apr. 30, 2011
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 6 - Senior Secured Convertible Notes to Related Parties (Details) [Line Items]          
Convertible Debt Issuable In Connection With Private Placement1   $ 4,500,000hrtx_ConvertibleDebtIssuableInConnectionWithPrivatePlacement1      
Proceeds from Convertible Debt   4,300,000us-gaap_ProceedsFromConvertibleDebt     3,000,000us-gaap_ProceedsFromConvertibleDebt
Common Shares Registered For Resale In Connection With Convertible Notes (in Shares) 3,500,000hrtx_CommonSharesRegisteredForResaleInConnectionWithConvertibleNotes        
Interest Expense, Debt, Excluding Amortization     314,000us-gaap_InterestExpenseDebtExcludingAmortization 295,000us-gaap_InterestExpenseDebtExcludingAmortization 216,000us-gaap_InterestExpenseDebtExcludingAmortization
Amortization of Debt Discount (Premium)     573,000us-gaap_AmortizationOfDebtDiscountPremium 533,000us-gaap_AmortizationOfDebtDiscountPremium 389,000us-gaap_AmortizationOfDebtDiscountPremium
Carrying Value of Notes Outstanding     1,598,000hrtx_ConvertibleNotesPayableRelatedPartiesCurrent 1,025,000hrtx_ConvertibleNotesPayableRelatedPartiesCurrent  
In Case of Debt Conversion [Member] | Convertible Debt Securities [Member]          
Note 6 - Senior Secured Convertible Notes to Related Parties (Details) [Line Items]          
Debt Instrument, Face Amount     5,341,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= hrtx_InCaseOfDebtConversionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
   
Debt Instrument, Convertible, Number of Equity Instruments     6,676,845us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= hrtx_InCaseOfDebtConversionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
   
Common Stock [Member] | Convertible Debt Securities [Member]          
Note 6 - Senior Secured Convertible Notes to Related Parties (Details) [Line Items]          
Debt Instrument Conversion Ratio, Shares (in Shares)   1,250hrtx_DebtInstrumentConversionRatioShares
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Convertible Debt Securities [Member]          
Note 6 - Senior Secured Convertible Notes to Related Parties (Details) [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage   6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
     
Debt Instrument, Maturity Date   May 02, 2021      
Debt Instrument Conversion Ratio, Multiple of Principal   1,000hrtx_DebtInstrumentConversionRatioMultipleOfPrincipal
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
     
Beneficial Ownership After Conversion   9.99%hrtx_BeneficialOwnershipAfterConversion
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
     
Notice Period Associated with Beneficial Ownership Percentage Limitation, Convertible Notes   61 days      
Paid-in-Kind Interest     309,000us-gaap_PaidInKindInterest
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
   
Debt Instrument, Increase (Decrease), Other, Net     309,000us-gaap_DebtInstrumentIncreaseDecreaseOtherNet
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
   
Carrying Value of Notes Outstanding     1,598,000hrtx_ConvertibleNotesPayableRelatedPartiesCurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
   
Debt Instrument, Face Amount     5,341,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
   
Debt Instrument, Unamortized Discount     $ 3,743,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember