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Note 13 - Other Income (Expense), Net (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Nonoperating Income (Expense), Total	$ 3,434	$ (552)	$ 3,342	$ (2,326)
Disgorgement of Short-Swing Profits from the Sale of Common Stock [Member]
Other Nonoperating Income (Expense), Total	$ 1,900

X

- Definition

Amount of income (expense) related to nonoperating activities, classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

+ Details

Name:	us-gaap_OtherNonoperatingIncomeExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=hrtx_DisgorgementOfShortswingProfitsFromTheSaleOfCommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: