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Note 7 - Stockholders' Equity (Details) - Warrants Outstanding (USD $) | Dec. 31, 2014
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Class of Warrant or Right [Line Items] |
Number of shares outstanding | 4,108,147 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Private Placement, October 2009 [Member] |
Class of Warrant or Right [Line Items] |
Number of shares outstanding | 198,860 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = hrtx_PrivatePlacementOctober2009Member
Exercise price (in Dollars per share) | 17.60 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = hrtx_PrivatePlacementOctober2009Member
Private Placement, July 2011 [Member] |
Class of Warrant or Right [Line Items] |
Number of shares outstanding | 3,289,287 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = hrtx_PrivatePlacementJuly2011Member
Exercise price (in Dollars per share) | 3.60 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = hrtx_PrivatePlacementJuly2011Member
Public Offering, June 2014 [Member] |
Class of Warrant or Right [Line Items] |
Number of shares outstanding | 600,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = hrtx_PublicOfferingJune2014Member
Exercise price (in Dollars per share) | 0.01 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = hrtx_PublicOfferingJune2014Member
Other Warrants [Member] |
Class of Warrant or Right [Line Items] |
Number of shares outstanding | 20,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = hrtx_OtherWarrantsMember
Exercise price (in Dollars per share) | 13.80 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = hrtx_OtherWarrantsMember

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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Balance Type: | na
Period Type: | instant

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- Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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Name: | us-gaap_ClassOfWarrantOrRightAxis=hrtx_PrivatePlacementJuly2011Member
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Data Type: | na
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Name: | us-gaap_ClassOfWarrantOrRightAxis=hrtx_PrivatePlacementOctober2009Member
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Name: | us-gaap_ClassOfWarrantOrRightAxis=hrtx_PublicOfferingJune2014Member
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