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Note 9 - Collaboration Agreements (Details) (USD $)	1 Months Ended
	Oct. 31, 2014	Aug. 31, 2014	Mar. 31, 2014
Subsequent Event [Member] | Genetech Affiliate [Member]
Note 9 - Collaboration Agreements (Details) [Line Items]
Proceeds from Issuance of Private Placement	$ 4,455us-gaap_ProceedsFromIssuanceOfPrivatePlacement / us-gaap_CounterpartyNameAxis = xene_GenetechAffiliateMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
GDC-0276 [Member] | Milestone Payment [Member] | Genetech [Member]
Note 9 - Collaboration Agreements (Details) [Line Items]
Contracts Revenue		8,000us-gaap_ContractsRevenue / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ProductOrServiceAxis = xene_GDC0276Member / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_MilestonePaymentMember
Recognition of Upfront Payment [Member] | Genetech [Member]
Note 9 - Collaboration Agreements (Details) [Line Items]
Contracts Revenue			1,500us-gaap_ContractsRevenue / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_RecognitionOfUpfrontPaymentMember
Milestone Payment [Member] | Genetech [Member]
Note 9 - Collaboration Agreements (Details) [Line Items]
Contracts Revenue			$ 2,000us-gaap_ContractsRevenue / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_MilestonePaymentMember

X

- Definition

Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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