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

No definition available.

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

- Definition

The amount of lease payments as per the amended agreement.

+ References

No definition available.

+ Details

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

- Definition

The period in which the lease agreement cannot be cancelled.

+ References

No definition available.

+ Details

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

- Definition

The percentage of annual increase in the monthly lease payments.

+ References

No definition available.

+ Details

Name:	akro_OperatingLeaseAgreementPercentageOfAnnualIncreaseInMonthlyLeasePayments
Namespace Prefix:	akro_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The period of notice for the cancellation of agreement.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8,17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_SecurityDeposit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments and contingencies (Details) - USD ($) $ in Thousands			3 Months Ended	6 Months Ended
	Oct. 01, 2019	Aug. 15, 2018	Jun. 30, 2019	Jun. 30, 2019
Commitments and contingencies
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
Monthly lease payments payable under the amended agreement	$ 19
Increase in rental expense (as a percentage)	3.00%
Security deposit			$ 20	$ 20
Rent expense			89	138
Non-cancelable purchase commitments with contract research organizations and contract manufacturing organizations			$ 5,172	$ 5,172