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Note 4 - Financial Assets Measured on a Recurring Basis (Details) $ in Thousands	Jun. 30, 2016 USD ($)
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value	$ 55,330	[1]
Money Market Funds [Member]
Assets, fair value	55,330	[1]
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value	4,904	[1]
Domestic Corporate Debt Securities [Member]
Assets, fair value	4,904
United States Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value	7,796	[1]
United States Commercial Paper [Member]
Assets, fair value	7,796
Fair Value, Inputs, Level 1 [Member]
Assets, fair value	55,330	[1]
Fair Value, Inputs, Level 2 [Member]
Assets, fair value	12,700	[1]
Assets, fair value	$ 68,030
[1] There were no significant transfers between level 1 and level 2 investments during the six months ended June 30, 2016.

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_DomesticCorporateDebtSecuritiesMember
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Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
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Data Type:	na
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X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=hrtx_UnitedStatesCommercialPaperMember
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Balance Type:
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