Share Capital - Stock Option Activity (Parenthetical) (Details) - shares	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Options exercised for Number of Common Shares for cash	0	58,179
Common stock issued for cashless exercise	234,783	179,129
Cashless exercise of stock options	349,138	286,555

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