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Income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loss before income taxes      
Dutch operations $ (51,107) $ (63,304) $ (41,063)
Loss before income tax benefit / (expense) (72,229) (83,262) (50,312)
Current benefit / (expense)      
Dutch operations 0 0 0
Deferred benefit / (expense)      
Dutch operations (1,094) 714 535
Income tax benefit / (expense) (1,145) 1,179 535
U.S. operations      
Loss before income taxes      
Loss before income tax benefit / (expense) (21,221) (20,406) (8,937)
Foreign operations      
Loss before income taxes      
Loss before income tax benefit / (expense) 99 448 $ (312)
Current benefit / (expense)      
Current benefit / (expense) $ (51) (51)  
Deferred benefit / (expense)      
Deferred benefit / (expense)   $ 516