v3.8.0.1
Note 8 - Liability Related to Sale of Future Royalties (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Sep. 18, 2015
Sep. 30, 2015
Dec. 31, 2017
Proceeds From Sale of Royalty and Milestone Rights $ 65,000 $ 65,000  
Royalty Arrangment Maximum Payments $ 195,000 195,000  
Revenue Recognition Milestone Method Agreed, Additional Amount   $ 15,000  
Effective Annual Interest Rate 14.00% 14.00%  
Royalty Revenue     $ 31
First Four Commercial Milestones [Member]      
Percentage of Royalties and Rights Under Agreement 20.00%    
Royalties [Member]      
Percentage of Royalties and Rights Under Agreement 25.00%    
Remaining Commercial and All Development Milestone[Member]      
Percentage of Royalties and Rights Under Agreement 100.00%    
Commercial Milestones Value $ 43,500    
MAA Aproval [Member]      
Revenue Recognition Milestone Method Agreed, Additional Amount 15,000    
PDL [Member]      
Proceeds From Sale of Royalty and Milestone Rights $ 61,200    
Percentage of Royalties and Rights Under Agreement 75.00%    
PDL [Member] | First Four Commercial Milestones [Member]      
Percentage of Royalties and Rights Under Agreement 80.00%    
Commercial Milestones Value Maximum Amount Available $ 35,600    
AcelRX [Member] | First Four Commercial Milestones [Member]      
Commercial Milestones Value Maximum Amount Available $ 44,500