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Note 4 - Convertible Notes to Related Parties (Details Textual) (USD $)
0 Months Ended 1 Months Ended 3 Months Ended
Jul. 29, 2011
Apr. 30, 2011
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Convertible Debt Issuable in Connection with Private Placement   $ 4,500,000hrtx_ConvertibleDebtIssuableInConnectionWithPrivatePlacement      
Proceeds from Convertible Debt   4,300,000us-gaap_ProceedsFromConvertibleDebt      
Common Shares Registered for Resale in Connection with Convertible Notes 3,500,000hrtx_CommonSharesRegisteredForResaleInConnectionWithConvertibleNotes        
Interest Expense, Debt, Excluding Amortization     81,000us-gaap_InterestExpenseDebtExcludingAmortization 77,000us-gaap_InterestExpenseDebtExcludingAmortization  
Amortization of Debt Discount (Premium)     151,000us-gaap_AmortizationOfDebtDiscountPremium 139,000us-gaap_AmortizationOfDebtDiscountPremium  
Convertible Notes Payable, Related Parties, Current     1,749,000hrtx_ConvertibleNotesPayableRelatedPartiesCurrent   1,598,000hrtx_ConvertibleNotesPayableRelatedPartiesCurrent
Convertible Debt Securities [Member] | Common Stock [Member]          
Debt Instrument Conversion Ratio Shares   1,250hrtx_DebtInstrumentConversionRatioShares
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Convertible Debt Securities [Member] | In Case of Debt Conversion [Member]          
Debt Instrument, Face Amount     5,421,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= hrtx_InCaseOfDebtConversionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
   
Debt Instrument, Convertible, Number of Equity Instruments     6,776,998us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= hrtx_InCaseOfDebtConversionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
   
Convertible Debt Securities [Member]          
Debt Instrument, Maturity Date   May 02, 2021      
Debt Instrument, Interest Rate, Stated Percentage   6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
     
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     80,000us-gaap_PaidInKindInterest
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
   
Debt Instrument, Increase (Decrease), Other, Net     80,000us-gaap_DebtInstrumentIncreaseDecreaseOtherNet
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
   
Convertible Notes Payable, Related Parties, Current     1,749,000hrtx_ConvertibleNotesPayableRelatedPartiesCurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
   
Debt Instrument, Face Amount     5,421,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
   
Debt Instrument, Unamortized Discount     $ 3,672,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember