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Note 10 - Discontinued Operations (Details) - Income (Loss) from Discontinued Operations (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income (Loss) from Discontinued Operations [Abstract]
Change in estimates for guarantees	$ 1,082	$ (379)

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- Definition

Changes in estimates of the cosmeceutical and toiletry business sold to RP Scherer.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	hrtx_IncomeLossFromDiscontinuedOperationsAbstract
Namespace Prefix:	hrtx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration