Share Capital - Stock Option Activity (Parenthetical) (Details) - shares	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Common stock issued for cashless exercise	94,319	149,311
Cashless exercise of stock options	113,677	219,107

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