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Short-Term Investments - Additional Information (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Short-Term Investments [Abstract] |  |
Debt securities, impairment losses | $ 0 | $ 0
Debt securities, available-for-sale, realized gain (loss) | $ 0 | $ 0

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- Definition Impairment losses on investments. + References No definition available. + Details
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Namespace Prefix: | hrtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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