Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit) - Parenthetical - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Condensed Consolidated Statements of Redeemable Preferred Stock and Stockholders' Equity (Deficit)
Net issuance costs and underwriting fees	$ 10,348
Net Issuance cost		$ 216

Amount of net issuance cost and underwriting fees during the period of an entity.

No definition available.

Name:	akro_NetIssuanceCostAndUnderwritingFees
Namespace Prefix:	akro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration