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Related party transactions (Details) - USD ($) $ in Thousands		6 Months Ended
	Aug. 15, 2018	Jun. 30, 2019
Related Party Transaction
Non cancellation period for use and occupancy agreement	9 months
Written notice for cancellation of agreement	60 days
Base rental expense for the office space	$ 12
Atlas Venture Life Science Advisors, LLC
Related Party Transaction
Non cancellation period for use and occupancy agreement	9 months
Written notice for cancellation of agreement	60 days
Base rental expense for the office space	$ 12
Amount owed to related party		$ 8

X

- Definition

The amount of annual base rent included in the monthly lease payments.

+ References

No definition available.

+ Details

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

X

- Definition

The period in which the lease agreement cannot be cancelled.

+ References

No definition available.

+ Details

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Namespace Prefix:	akro_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The period of notice for the cancellation of agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	akro_
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X

- Definition

The amount of any current tax-related balances due to affiliates as of the date of each statement of financial position presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 17
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: