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Subsequent event - Additional Information (Details)	Mar. 19, 2014 USD ($)
Genentech [Member] | Maximum [Member]
Subsequent Event [Line Items]
Potential milestone payments receivable	$ 1,500

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Potential milestone payments receivable.

+ References

No definition available.

+ Details

Name:	xene_PotentialMilestonePaymentsReceivable
Namespace Prefix:	xene_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	srt_CounterpartyNameAxis=xene_GenentechMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: