Share Capital - Stock Option Activity (Parenthetical) (Details) - shares	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Share-Based Payment Arrangement [Abstract]
Stock Options exercised for Number of Common Shares for cash	513,500	85,230
Common stock issued for cashless exercise	568,841	438,495
Cashless exercise of stock options	1,102,626	916,765

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