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Note 5 - Stockholders' Equity (Details Textual) (USD $)
3 Months Ended 1 Months Ended 25 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2011
Jul. 31, 2012
Nov. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Net 351,698hrtx_StockIssuedDuringPeriodSharesStockOptionsExercisedNet 215,350hrtx_StockIssuedDuringPeriodSharesStockOptionsExercisedNet          
Proceeds from Stock Options Exercised $ 2,878,000us-gaap_ProceedsFromStockOptionsExercised $ 958,000us-gaap_ProceedsFromStockOptionsExercised          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 352,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 275,352us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 29,947,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 146 days            
Private Placement 2011 [Member] | Common Stock [Member]              
Stock Issued During Period, Shares, New Issues 47,588us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2011Member
108,409us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2011Member
8,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2011Member
       
Stock Issued During Period, Value, New Issues     22,800,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2011Member
       
Payments of Stock Issuance Costs     1,200,000us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2011Member
       
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right     0.5us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2011Member
       
Private Placement 2011 [Member] | Warrant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised 66,667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2011Member
144,040us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2011Member
         
Private Placement 2011 [Member]              
Proceeds from Warrant Exercises 0us-gaap_ProceedsFromWarrantExercises
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2011Member
0us-gaap_ProceedsFromWarrantExercises
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2011Member
         
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 3.60us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2011Member
       
Private Placement 2012 [Member] | Common Stock [Member]              
Stock Issued During Period, Shares, New Issues       5,100,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2012Member
     
Stock Issued During Period, Value, New Issues       50,500,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2012Member
     
Payments of Stock Issuance Costs       3,100,000us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2012Member
     
Private Placement 2012 [Member]              
Sale of Stock, Price Per Share       $ 10.50us-gaap_SaleOfStockPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= hrtx_PrivatePlacement2012Member
     
Common Stock [Member] | Jefferies, LLC [Member]              
Stock Issued During Period, Shares, New Issues         7,700,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ dei_LegalEntityAxis
= hrtx_JefferiesLlcMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Payments of Stock Issuance Costs         3,900,000us-gaap_PaymentsOfStockIssuanceCosts
/ dei_LegalEntityAxis
= hrtx_JefferiesLlcMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Sale of Stock, Price Per Share         $ 8us-gaap_SaleOfStockPricePerShare
/ dei_LegalEntityAxis
= hrtx_JefferiesLlcMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Proceeds from Issuance of Common Stock         57,800,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= hrtx_JefferiesLlcMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Common Stock [Member]              
Stock Issued During Period, Shares, New Issues           4,800,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Sale of Stock, Price Per Share           $ 11.75us-gaap_SaleOfStockPricePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Common Stock and Prefunded Warrants [Member]              
Payments of Stock Issuance Costs           4,000,000us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementEquityComponentsAxis
= hrtx_CommonStockAndPrefundedWarrantsMember
 
Proceeds from Issuance or Sale of Equity           $ 58,900,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ us-gaap_StatementEquityComponentsAxis
= hrtx_CommonStockAndPrefundedWarrantsMember
 
Private Placement 2011 [Member]              
Limitation on Exercisable Warrants             9.99%hrtx_LimitationOnExercisableWarrants
/ us-gaap_StatementClassOfStockAxis
= hrtx_PrivatePlacement2011Member
Pre-funded Warrants[Member]              
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 0.01us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= hrtx_PreFundedWarrantsMember
 
Class of Warrant or Right, Number of Securities Called by Warrants or Rights           600,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= hrtx_PreFundedWarrantsMember
 
Share Price           $ 11.74us-gaap_SharePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= hrtx_PreFundedWarrantsMember