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Note 6 - Inventory (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Research and Development Expense [Member] | CINVANTI [Member]
Manufacturing Costs	$ 1.4

X

- Definition

The aggregate costs incurred in the production of goods for sale.

+ 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 210.5-03.2(a))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

+ Details

Name:	us-gaap_ManufacturingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=hrtx_CINVANTIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: