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Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating activities:      
Net income (loss) $ 13,018us-gaap_NetIncomeLoss $ 12,032us-gaap_NetIncomeLoss $ (4,301)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation and amortization 738us-gaap_DepreciationAndAmortization 705us-gaap_DepreciationAndAmortization 786us-gaap_DepreciationAndAmortization
Loss (gain) on write-off of assets   (11)us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges 1,030us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
Stock-based compensation 760us-gaap_ShareBasedCompensation 575us-gaap_ShareBasedCompensation 406us-gaap_ShareBasedCompensation
Non-cash compensation on issuance of subscription rights   73xene_NoncashCompensationOnIssuanceOfSubscriptionRights 8xene_NoncashCompensationOnIssuanceOfSubscriptionRights
Interest accrued on note payable     77us-gaap_IncreaseDecreaseInInterestPayableNet
Deferred tenant inducements (66)xene_DeferredTenantInducementsAdjustments (115)xene_DeferredTenantInducementsAdjustments 183xene_DeferredTenantInducementsAdjustments
Foreign exchange loss (gain) 72us-gaap_ForeignCurrencyTransactionGainLossUnrealized 94us-gaap_ForeignCurrencyTransactionGainLossUnrealized (34)us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Changes in operating assets and liabilities:      
Accounts receivable 209us-gaap_IncreaseDecreaseInAccountsReceivable (76)us-gaap_IncreaseDecreaseInAccountsReceivable 11,230us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses, and other current assets (573)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (14)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 162us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued expenses 518us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (228)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 540us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue (14,410)us-gaap_IncreaseDecreaseInDeferredRevenue (16,357)us-gaap_IncreaseDecreaseInDeferredRevenue 35,486us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash provided by (used in) operating activities 266us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (3,322)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 45,573us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities:      
Purchases of property, plant and equipment (1,529)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (156)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (526)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Sale of property, plant and equipment   10us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 7us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Purchase of marketable securities (15,254)us-gaap_PaymentsToAcquireMarketableSecurities (17,876)us-gaap_PaymentsToAcquireMarketableSecurities  
Proceeds from marketable securities 13,539us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 6,550us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 1,010us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Net cash provided by (used in) investing activities (3,244)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (11,472)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 491us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities:      
Note payable   (1,701)us-gaap_RepaymentsOfNotesPayable  
Deferred financing fees (1,533)us-gaap_PaymentsOfStockIssuanceCosts (2,739)us-gaap_PaymentsOfStockIssuanceCosts  
Proceeds from issuance of common shares, net of issuance costs 42,657us-gaap_ProceedsFromIssuanceOfCommonStock 49us-gaap_ProceedsFromIssuanceOfCommonStock  
Net cash provided by (used in) financing activities 41,124us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (4,391)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations  
Effect of exchange rate changes on cash and cash equivalents (4,070)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations (3,027)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations 170us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Increase (decrease) in cash and cash equivalents 34,076us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (22,212)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 46,234us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year 37,950us-gaap_CashAndCashEquivalentsAtCarryingValue 60,162us-gaap_CashAndCashEquivalentsAtCarryingValue 13,928us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year 72,026us-gaap_CashAndCashEquivalentsAtCarryingValue 37,950us-gaap_CashAndCashEquivalentsAtCarryingValue 60,162us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures:      
Interest paid   201us-gaap_InterestPaid  
Interest received 574us-gaap_ProceedsFromInterestReceived 279us-gaap_ProceedsFromInterestReceived 170us-gaap_ProceedsFromInterestReceived
Supplemental disclosures of non-cash transactions:      
Issuance of common shares on conversion of subscription rights 124us-gaap_ConversionOfStockAmountIssued1 45us-gaap_ConversionOfStockAmountIssued1 22us-gaap_ConversionOfStockAmountIssued1
Financing fees included in accounts payable and accrued liabilities 39xene_FinancingFeesIncludedInAccountsPayableAndAccruedLiabilities    
Conversion of convertible preferred shares into common shares $ 102,488us-gaap_ConversionOfStockAmountConverted1