Warrants and derivative liability - Reconciliation of company's additional warrants (Details) - Additional Warrants $ in Thousands	6 Months Ended
Jun. 30, 2022 USD ($)
Reconciliation of company's additional warrants derivative liability
Balance at beginning of period	$ 331
Change in fair value	(109)
Derecognition	(206)
Balance at end of period	$ 16

Amount of changes in fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

No definition available.

+ Details

Name:	aptx_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityChangeInFairValue
Namespace Prefix:	aptx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of derecognition of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

No definition available.

+ Details

Name:	aptx_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityDerecognition
Namespace Prefix:	aptx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

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

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=aptx_AdditionalWarrantsMember
Namespace Prefix:
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Balance Type:
Period Type: