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Summary of significant accounting policies - Restricted cash (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Summary of significant accounting policies
Separate cash balance for the landlord	$ 108		$ 108
Separate cash balance to collateralize corporate credit cards with a bank			$ 40
Aggregate market value of stock		$ 700,000

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- Definition

The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.

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No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

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- Definition

Amount of cash restricted as to collateralize corporate credit cards with a bank, classified as noncurrent.

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No definition available.

+ Details

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Namespace Prefix:	akro_
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Balance Type:	debit
Period Type:	instant

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- Definition

Amount of cash restricted as to the benefit of the landlord in connection with the Company's office space lease in California (the "Lease"), classified as noncurrent.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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