Share Capital - Stock Option Activity (Parenthetical) (Details) - shares	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]
Common stock issued for cashless exercise	88,704	94,319
Cashless exercise of stock options	180,424	113,677

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