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Note 7 - Warrants Outstanding (Details) | Dec. 31, 2015 $ / shares shares
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Private Placement, July 2011 [Member] |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 2,965,477
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 3.60
Public Offering, June 2014 [Member] |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 600,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 3,565,477

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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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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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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 + Details
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- Details
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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=hrtx_PublicOfferingJune2014Member
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