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Note 10 - Discontinued Operations (Details) - Income (Loss) from Discontinued Operations (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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
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Namespace Prefix: | hrtx_
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Period Type: | duration