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Subsequent Event - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended
--- | ---
Oct. 31, 2021 | Oct. 31, 2020
Subsequent Event [Line Items] |  |
Restructuring charges, total |  | $ 5.6
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Restructuring charges, total | $ 1.6 |
Employee Severance |  |
Subsequent Event [Line Items] |  |
Restructuring charges, total |  | 2.5
Employee Severance | Subsequent Event |  |
Subsequent Event [Line Items] |  |
Restructuring charges, total | 1.5 |
Accelerated Non-Cash Stock Option Expense |  |
Subsequent Event [Line Items] |  |
Restructuring charges, total |  | $ 3.1
Accelerated Non-Cash Stock Option Expense | Subsequent Event |  |
Subsequent Event [Line Items] |  |
Restructuring charges, total | $ 0.1 |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=hrtx_AcceleratedNoncashStockOptionExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |