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Note 3 - Financial Assets Measured on a Recurring Basis (Details) $ in Thousands | Dec. 31, 2015 USD ($)
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Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |
Assets, fair value | $ 67,089
Money Market Funds [Member] |
Assets, fair value | 67,089
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |
Assets, fair value | 28,715
Domestic Corporate Debt Securities [Member] |
Assets, fair value | 28,715
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |
Assets, fair value | 4,922
Foreign Corporate Debt Securities [Member] |
Assets, fair value | 4,922
United States Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] |
Assets, fair value | 7,770
United States Commercial Paper [Member] |
Assets, fair value | 7,770
Foreign Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] |
Assets, fair value | 15,579
Foreign Commercial Paper [Member] |
Assets, fair value | 15,579
Fair Value, Inputs, Level 1 [Member] |
Assets, fair value | 67,089
Fair Value, Inputs, Level 2 [Member] |
Assets, fair value | 56,986
Assets, fair value | $ 124,075

X
- 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

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_DomesticCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_ForeignCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=hrtx_UnitedStatesCommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=hrtx_ForeignCommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |