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Commitments and Contingencies (Details Textual)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Aug. 01, 2013
ft²
Commitments And Contingencies (Textual) [Abstract]      
Rent expense $ 40 $ 39  
Clinical research agreement with Duke University, termination notice period 90 days    
Expected milestone payments due upon approval $ 8,000    
Another expected milestone payments due upon approval $ 5,000    
Minimum percentage of royalty obligation 12.50%    
Maximum percentage of royalty obligation 25.00%    
Product sales levels royalty 5.00%    
Minimum percentage of range of royalties that can be bought down 12.50%    
Maximum percentage of range of royalties that can be bought down 17.00%    
Royalty buy down due period 6 months    
Westminster, Colorado      
Commitments And Contingencies (Textual) [Abstract]      
Area of office facilities taken on lease | ft²     5,300
Lease term 3 years    
Lease expiry date Sep. 30, 2016