Share Capital - Stock Option Activity (Parenthetical) (Details) - shares	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]
Stock Options exercised for Number of Common Shares for cash	85,230	0
Common stock issued for cashless exercise	438,495	296,573
Cashless exercise of stock options	916,765	448,069

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