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Other Non-current Assets - Schedule of Other Non-current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Royalty receivable | $ 2,000 | $ 3,000
Other | 1,199 | 1,223
Total other non-current assets | $ 3,199 | $ 4,223

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- Definition Cumulative sum of the carrying amounts of royalty receivable as of the balance sheet date. + References No definition available. + Details
Name: | aqst_CumulativeRoyaltyReceivable
Namespace Prefix: | aqst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_OtherAssetsMiscellaneousNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of noncurrent assets classified as other. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_OtherAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant