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Note 9 - Collaboration Agreements (Details) - Revenue Recognized from Collaborations (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Deferred Revenue Arrangement [Line Items]
Collaboration Revenue	$ 13,192us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized	$ 10,786us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized	$ 23,489us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized	$ 21,771us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized
Collaborative Arrangement [Member] | Milestone Payment [Member] | UniQure [Member]
Deferred Revenue Arrangement [Line Items]
Collaboration Revenue	14us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_UniQureMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_MilestonePaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	267us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_UniQureMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_MilestonePaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	14us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_UniQureMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_MilestonePaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	267us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_UniQureMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_MilestonePaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember
Collaborative Arrangement [Member] | Milestone Payment [Member] | Genetech [Member]
Deferred Revenue Arrangement [Line Items]
Collaboration Revenue	7,987us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_MilestonePaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	5,093us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_MilestonePaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	7,987us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_MilestonePaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	5,093us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_MilestonePaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember
Collaborative Arrangement [Member] | Recognition of Upfront Payment [Member] | Teva [Member]
Deferred Revenue Arrangement [Line Items]
Collaboration Revenue	3,132us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_TevaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_RecognitionOfUpfrontPaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	3,284us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_TevaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_RecognitionOfUpfrontPaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	9,252us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_TevaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_RecognitionOfUpfrontPaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	9,891us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_TevaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_RecognitionOfUpfrontPaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember
Collaborative Arrangement [Member] | Recognition of Upfront Payment [Member] | Genetech [Member]
Deferred Revenue Arrangement [Line Items]
Collaboration Revenue	981us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_RecognitionOfUpfrontPaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	824us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_RecognitionOfUpfrontPaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	2,736us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_RecognitionOfUpfrontPaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	2,483us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_RecognitionOfUpfrontPaymentMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember
Collaborative Arrangement [Member] | Research Funding [Member] | Teva [Member]
Deferred Revenue Arrangement [Line Items]
Collaboration Revenue	84us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_TevaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_ResearchFundingMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	169us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_TevaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_ResearchFundingMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	251us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_TevaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_ResearchFundingMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	463us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_TevaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_ResearchFundingMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember
Collaborative Arrangement [Member] | Research Funding [Member] | Genetech [Member]
Deferred Revenue Arrangement [Line Items]
Collaboration Revenue	994us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_ResearchFundingMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	1,128us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_ResearchFundingMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	3,249us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_ResearchFundingMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember	3,385us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_ResearchFundingMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember
Collaborative Arrangement [Member] | Research Funding [Member] | Genome BC [Member]
Deferred Revenue Arrangement [Line Items]
Collaboration Revenue		$ 21us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenomeBCMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_ResearchFundingMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember		$ 189us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = xene_GenomeBCMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_ResearchFundingMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember

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- Definition

The amount of consideration recognized during the period for the milestone or milestones.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 28

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=19771982&loc=SL6892177-166501

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