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LIABILITY RELATED TO SETTLEMENT ROYALTIES, WORKING CAPITAL FUND LIABILITY AND LIABILITY RELATED TO SALE OF FUTURE ROYALTIES - Schedule of Liability Related to Settlement Royalties (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Other Liabilities Disclosure [Abstract] |  |
Current portion (included in accrued expenses and other current liabilities) | $ 12,516 | $ 5,924
Long-term portion | 54,750 | 46,697
Total settlement royalties liability | $ 67,266 | $ 52,621

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- Definition Contractual Arrangement, Royalties Agreement, Settlement Liability + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Contractual Arrangement, Royalties Agreement, Settlement Liability, Current + References No definition available. + Details
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- Definition Contractual Arrangement, Royalties Agreement, Settlement Liability, Noncurrent + References No definition available. + Details
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Namespace Prefix: | akba_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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