Share Capital - Stock Option Activity (Parenthetical) (Details) - shares	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]
Common stock issued for cashless exercise	280,649	234,783
Cashless exercise of stock options	391,746	349,138

Number of common stock issued in exchange for share options (or share units) exercised via net exercise (cashless) method during the current period.

No definition available.

Name:	xene_CommonStockIssuedForCashlessExercise
Namespace Prefix:	xene_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration