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Collaboration arrangements and concentration of credit risk - Amounts receivable (Details) - Collaboration arrangement - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Collaboration arrangements    
Amounts owed from partners in relation to the collaboration $ 1,750 $ 9,180
Chiesi Farmaceuticai S.p.A    
Collaboration arrangements    
Amounts owed from partners in relation to the collaboration 1,233 3,680
BMS    
Collaboration arrangements    
Amounts owed from partners in relation to the collaboration $ 517 $ 5,500