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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
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

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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

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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

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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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Balance Type:	na
Period Type:	duration