Nature of Organization and Operations - Additional Information (Details)	3 Months Ended
Mar. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of months for operating plan sufficiently funded by cash resources	12 months

Operating plan sufficiently funded by cash resources, period.

No definition available.

Name:	akba_OperatingPlanSufficientlyFundedByCashResourcesPeriod
Namespace Prefix:	akba_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration