Share Capital - Stock Option Activity (Parenthetical) (Details) - shares	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock Options exercised for Number of Common Shares for cash	318,813	5,144	4,320
Common stock issued for cashless exercise	594,076	729,965	377,114
Cashless exercise of stock options	1,482,817	1,034,992	583,216

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