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Concentrations of Credit Risk (Revenues by Geographic Region) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Concentration Risk [Line Items]    
Collaboration revenues $ 12,010 $ 6,328
Geographic Concentration Risk [Member] | Revenues [Member] | U.S. [Member]    
Concentration Risk [Line Items]    
Collaboration revenues 73,675 13,594
Geographic Concentration Risk [Member] | Revenues [Member] | Europe [Member]    
Concentration Risk [Line Items]    
Collaboration revenues 4,530 1,833
Geographic Concentration Risk [Member] | Revenues [Member] | Japan [Member]    
Concentration Risk [Line Items]    
Collaboration revenues $ 2,682 $ 0