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Note 5 - Commitments and Contingencies (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) ft² | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Operating Lease, Annual Rent Expense | $ 2.0 |  |
Operating Leases, Rent Expense | 2.1 | $ 1.5 | $ 1.4
Purchase Obligation | 6.7 |  |
Unrecorded Unconditional Purchase Obligation | $ 4.6 |  |
San Diego [Member] |  |  |
Area of Real Estate Property | ft² | 28,275 |  |
Lessee Leasing Arrangements, Operating Leases, Renewal Term | 5 years |  |
Redwood City [Member] |  |  |
Area of Real Estate Property | ft² | 26,067 |  |
Jersey City [Member] |  |  |
Area of Real Estate Property | ft² | 1,898 |  |

X
- Definition Amount of the annual rent required for all operating leases. + References No definition available. + Details
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Namespace Prefix: | hrtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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X
- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25336-109308 + Details
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X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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

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