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Note 5 - Commitments and Contingencies (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 5 - Commitments and Contingencies (Details) [Line Items] |  |  |
Operating Leases, Rent Expense | $ 1,381,000 us-gaap_LeaseAndRentalExpense | $ 967,000 us-gaap_LeaseAndRentalExpense | $ 580,000 us-gaap_LeaseAndRentalExpense
Purchase Obligation | 877,000 us-gaap_PurchaseObligation |  |
Unrecorded Unconditional Purchase Obligation | $ 218,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount |  |
Redwood City [Member] |  |  |
Note 5 - Commitments and Contingencies (Details) [Line Items] |  |  |
Area of Real Estate Property (in Square Feet) | 26,067 us-gaap_AreaOfRealEstateProperty / us-gaap_LeaseArrangementTypeAxis = hrtx_RedwoodCityMember |  |
Stamford [Member] |  |  |
Note 5 - Commitments and Contingencies (Details) [Line Items] |  |  |
Area of Real Estate Property (in Square Feet) | 1,400 us-gaap_AreaOfRealEstateProperty / us-gaap_LeaseArrangementTypeAxis = hrtx_StamfordMember |  |
San Diego [Member] |  |  |
Note 5 - Commitments and Contingencies (Details) [Line Items] |  |  |
Area of Real Estate Property (in Square Feet) | 2,020 us-gaap_AreaOfRealEstateProperty / us-gaap_LeaseArrangementTypeAxis = hrtx_SanDiegoMember |  |

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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