Share Capital - Stock Option Activity (Parenthetical) (Details) - shares	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]
Common stock issued for cashless exercise	296,573	280,649
Cashless exercise of stock options	448,069	391,746

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