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LIABILITY RELATED TO SETTLEMENT ROYALTIES, WORKING CAPITAL FUND LIABILITY AND LIABILITY RELATED TO SALE OF FUTURE ROYALTIES - Liability Related to Settlement Royalties (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Other Liabilities Disclosure [Abstract] |  |
Current portion (included in accrued expenses and other current liabilities) | $ 10,577 | $ 5,924
Long-term portion | 47,440 | 46,697
Total settlement royalties liability | $ 58,017 | $ 52,621

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

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

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

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