Share Capital - Stock Option Activity (Parenthetical) (Details) - shares	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Stock Options exercised for Number of Common Shares for cash	80,086	0
Common stock issued for cashless exercise	90,187	88,704
Cashless exercise of stock options	179,729	180,424

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