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Contingencies and commitments - Clinical Trials and Contract Manufacturing Commitments (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Clinical trials commitment    
Contingencies and commitments    
Other commitments $ 24,942 $ 23,509
Contract manufacturing commitment    
Contingencies and commitments    
Other commitments $ 19,472 $ 16,612