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Note 11 - Subsequent Events (Details) (USD $)
0 Months Ended
Oct. 01, 2014
Nov. 10, 2014
Sep. 30, 2014
Dec. 31, 2013
Note 11 - Subsequent Events (Details) [Line Items]        
Common Stock, Shares, Outstanding     1,349,591us-gaap_CommonStockSharesOutstanding 1,344,627us-gaap_CommonStockSharesOutstanding
Series A Preferred Stock [Member] | Preferred Stock [Member] | Subsequent Event [Member] | Reverse Stock Split [Member]        
Note 11 - Subsequent Events (Details) [Line Items]        
Stockholders' Equity Note, Stock Split, Conversion Ratio 4.86us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
/ us-gaap_NonmonetaryTransactionTypeAxis
= xene_ReverseStockSplitMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Series A Preferred Stock [Member] | Subsequent Event [Member]        
Note 11 - Subsequent Events (Details) [Line Items]        
Convertible Preferred Stock, Shares Issued upon Conversion   1us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Series B Preferred Stock [Member] | Preferred Stock [Member] | Subsequent Event [Member] | Reverse Stock Split [Member]        
Note 11 - Subsequent Events (Details) [Line Items]        
Stockholders' Equity Note, Stock Split, Conversion Ratio 4.86us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
/ us-gaap_NonmonetaryTransactionTypeAxis
= xene_ReverseStockSplitMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Series B Preferred Stock [Member] | Subsequent Event [Member]        
Note 11 - Subsequent Events (Details) [Line Items]        
Convertible Preferred Stock, Shares Issued upon Conversion   1us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Series E Preferred Stock [Member] | Preferred Stock [Member] | Subsequent Event [Member] | Reverse Stock Split [Member]        
Note 11 - Subsequent Events (Details) [Line Items]        
Stockholders' Equity Note, Stock Split, Conversion Ratio 4.86us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
/ us-gaap_NonmonetaryTransactionTypeAxis
= xene_ReverseStockSplitMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Series E Preferred Stock [Member] | Subsequent Event [Member]        
Note 11 - Subsequent Events (Details) [Line Items]        
Convertible Preferred Stock, Shares Issued upon Conversion   1.20us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
IPO [Member] | Subsequent Event [Member]        
Note 11 - Subsequent Events (Details) [Line Items]        
Stock Issued During Period, Shares, New Issues   4,600,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Share Price (in Dollars per share)   $ 9.00us-gaap_SharePrice
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Private Placement [Member] | Common Stock [Member] | Subsequent Event [Member] | Genetech Affiliate [Member]        
Note 11 - Subsequent Events (Details) [Line Items]        
Stock Issued During Period, Shares, New Issues   495,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_CounterpartyNameAxis
= xene_GenetechAffiliateMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
   
Share Price (in Dollars per share)   $ 9.00us-gaap_SharePrice
/ us-gaap_CounterpartyNameAxis
= xene_GenetechAffiliateMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
   
Common Stock [Member] | Subsequent Event [Member] | Reverse Stock Split [Member]        
Note 11 - Subsequent Events (Details) [Line Items]        
Stockholders' Equity Note, Stock Split, Conversion Ratio 4.86us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
/ us-gaap_NonmonetaryTransactionTypeAxis
= xene_ReverseStockSplitMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Common Stock [Member] | Genetech Affiliate [Member]        
Note 11 - Subsequent Events (Details) [Line Items]        
Common Stock, Shares, Outstanding   14,181,333us-gaap_CommonStockSharesOutstanding
/ us-gaap_CounterpartyNameAxis
= xene_GenetechAffiliateMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember