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Note 9 - Collaboration Agreements (Details) (USD $) | 1 Months Ended
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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 | $ 4,455 us-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 |  | 8,000 us-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 |  |  | 1,500 us-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 |  |  | $ 2,000 us-gaap_ContractsRevenue / us-gaap_CounterpartyNameAxis = xene_GenetechMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = xene_MilestonePaymentMember

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- 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 + Details
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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 + Details
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