Share Capital - Stock Option Activity (Parenthetical) (Details) - shares	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Common stock issued for cashless exercise	423,432	283,863
Cashless exercise of stock options	627,662	398,097

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