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Collaboration arrangements and concentration of credit risk - Amounts receivable (Details) - Collaboration arrangement - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Collaboration arrangements    
Amounts owed from partners in relation to the collaboration $ 9,180 $ 4,129
Chiesi Farmaceuticai S.p.A    
Collaboration arrangements    
Amounts owed from partners in relation to the collaboration 3,680 3,120
BMS    
Collaboration arrangements    
Amounts owed from partners in relation to the collaboration $ 5,500 $ 1,009