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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 |  | $ 4,500,000 hrtx_ConvertibleDebtIssuableInConnectionWithPrivatePlacement1 |  |  |
Proceeds from Convertible Debt |  | 4,300,000 us-gaap_ProceedsFromConvertibleDebt |  |  | 3,000,000 us-gaap_ProceedsFromConvertibleDebt
Common Shares Registered For Resale In Connection With Convertible Notes (in Shares) | 3,500,000 hrtx_CommonSharesRegisteredForResaleInConnectionWithConvertibleNotes |  |  |  |
Interest Expense, Debt, Excluding Amortization |  |  | 314,000 us-gaap_InterestExpenseDebtExcludingAmortization | 295,000 us-gaap_InterestExpenseDebtExcludingAmortization | 216,000 us-gaap_InterestExpenseDebtExcludingAmortization
Amortization of Debt Discount (Premium) |  |  | 573,000 us-gaap_AmortizationOfDebtDiscountPremium | 533,000 us-gaap_AmortizationOfDebtDiscountPremium | 389,000 us-gaap_AmortizationOfDebtDiscountPremium
Carrying Value of Notes Outstanding |  |  | 1,598,000 hrtx_ConvertibleNotesPayableRelatedPartiesCurrent | 1,025,000 hrtx_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 |  |  | 5,341,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtConversionByUniqueDescriptionAxis = hrtx_InCaseOfDebtConversionMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |
Debt Instrument, Convertible, Number of Equity Instruments |  |  | 6,676,845 us-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) |  | 1,250 hrtx_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 |  | 1,000 hrtx_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 |  |  | 309,000 us-gaap_PaidInKindInterest / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |
Debt Instrument, Increase (Decrease), Other, Net |  |  | 309,000 us-gaap_DebtInstrumentIncreaseDecreaseOtherNet / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |
Carrying Value of Notes Outstanding |  |  | 1,598,000 hrtx_ConvertibleNotesPayableRelatedPartiesCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |
Debt Instrument, Face Amount |  |  | 5,341,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |
Debt Instrument, Unamortized Discount |  |  | $ 3,743,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the holder. + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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