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Note 11 - Other Income (Expense), Net (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Nonoperating Income (Expense), Total	$ 1,804	$ (38)	$ (9)
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: