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License agreements - Lilly (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended 88 Months Ended
Jan. 31, 2017
Mar. 31, 2016
USD ($)
Jul. 31, 2010
Dec. 31, 2009
USD ($)
item
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2010
USD ($)
Mar. 31, 2017
USD ($)
License agreements                    
Research and Development Expense         $ 407,972 $ 156,824        
Contract revenues         90,000 58,214        
Lilly                    
License agreements                    
Upfront payment received under license agreement       $ 90,000            
Research and Development Expense         9,400 5,100        
Number of deliverables under license agreement | item       2            
Contract revenues         65,000 58,200        
Net sales         400          
Product royalties in accounts receivable         $ 400         $ 400
Lilly | Maximum                    
License agreements                    
Associated future royalty payments from the initiation of a Phase IIb trial, if elected to not co-develop, percentage         20.00%          
Lilly | Phase Two A                    
License agreements                    
Funding of future development costs (as a percent) 30.00%                  
Lilly | Phase Two B                    
License agreements                    
Funding of future development costs (as a percent)     30.00%   30.00%          
Lilly | Pre-specified Events | Maximum                    
License agreements                    
Upfront and immediate milestone payment to be received under license agreement       $ 665,000            
Lilly | Development Milestones                    
License agreements                    
Amount recognized and received for the achievement of a predefined milestone                   99,000
Lilly | Development Milestones | Maximum                    
License agreements                    
Upfront and immediate milestone payment to be received under license agreement       150,000            
Lilly | Development Milestones | Phase Three                    
License agreements                    
Amount recognized and received for the achievement of a predefined milestone               $ 50,000    
Lilly | Development Milestones | Phase Two A                    
License agreements                    
Amount recognized and received for the achievement of a predefined milestone                 $ 30,000  
Lilly | Development Milestones | Phase Two B                    
License agreements                    
Amount recognized and received for the achievement of a predefined milestone                 $ 19,000  
Lilly | Regulatory Milestones                    
License agreements                    
Amount recognized and received for the achievement of a predefined milestone                   $ 120,000
Lilly | Regulatory Milestones | U.S.                    
License agreements                    
Amount recognized and received for the achievement of a predefined milestone             $ 35,000      
Lilly | Regulatory Milestones | Europe                    
License agreements                    
Amount recognized and received for the achievement of a predefined milestone         $ 65,000   $ 20,000      
Lilly | Regulatory Milestones | Maximum                    
License agreements                    
Upfront and immediate milestone payment to be received under license agreement       365,000            
Lilly | Commercialization Milestones | Maximum                    
License agreements                    
Upfront and immediate milestone payment to be received under license agreement       $ 150,000            
Lilly | GVHD                    
License agreements                    
Research and Development Expense           35,000        
Upfront payment under license agreement   $ 35,000                
Additional milestone payments under the license agreement   $ 40,000       $ 40,000