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Note Payable (Details) (Isis [Member], USD $)
In Thousands, unless otherwise specified
1 Months Ended
Jun. 30, 2013
Nov. 30, 2010
Isis [Member]
   
Debt Instrument [Line Items]    
Convertible promissory note issued for payment of an upfront fee   $ 1,500us-gaap_ConvertibleNotesPayable
/ us-gaap_CounterpartyNameAxis
= xene_IsisPharmaceuticalsIncMember
Convertible promissory note interest rate   5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CounterpartyNameAxis
= xene_IsisPharmaceuticalsIncMember
Repayment of promissory notes $ 1,701us-gaap_RepaymentsOfConvertibleDebt
/ us-gaap_CounterpartyNameAxis
= xene_IsisPharmaceuticalsIncMember