Statements of Stockholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2020
IPO
Stock issuance costs capitalized		$ 1,733
At The Market Offering Program
Discount and other offering costs	$ 237	$ 237

The amount of underwriters discount and other offering costs incurred during the period.

No definition available.

Name:	aptx_UnderwritersDiscountAndOtherOfferingCosts
Namespace Prefix:	aptx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration