Statements of Stockholders' (Deficit) Equity (Parenthetical) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($)
Statements of Stockholders' (Deficit) Equity
Stock issuance costs capitalized	$ 2,902

The amount of stock issuance costs capitalized during the period.

No definition available.

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