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Collaboration arrangements and concentration of credit risk - Revenues (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Collaboration arrangements    
Revenues $ 3,321 $ 4,295
BMS | Minimum    
Collaboration arrangements    
Ownership percentage 5.00%  
Collaboration arrangement    
Collaboration arrangements    
Revenues $ 3,321 4,295
Collaboration arrangement | BMS    
Collaboration arrangements    
Revenues 1,507 2,628
Collaboration arrangement | Chiesi Farmaceuticai S.p.A    
Collaboration arrangements    
Revenues $ 1,814 $ 1,667