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Note 7 - Warrants Outstanding (Details)	Dec. 31, 2015 $ / shares shares
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

X

- 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

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- 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

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=hrtx_PrivatePlacementJuly2011Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=hrtx_PublicOfferingJune2014Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: