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Commitments and contingencies - Contingencies (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Loss Contingency Accrual [Roll Forward]  
Contingencies accrual, beginning balance $ 654
Charges 960
Provision used (24)
Provision released not used (250)
Currency translation adjustments 52
Contingencies accrual, ending balance 1,392
Contingencies accrual, of which current 1,392
Provision for employee-related litigation  
Loss Contingency Accrual [Roll Forward]  
Contingencies accrual, beginning balance 485
Charges 6
Provision used 0
Provision released not used (250)
Currency translation adjustments 26
Contingencies accrual, ending balance 267
Contingencies accrual, of which current 267
Other provisions  
Loss Contingency Accrual [Roll Forward]  
Contingencies accrual, beginning balance 169
Charges 954
Provision used (24)
Provision released not used 0
Currency translation adjustments 26
Contingencies accrual, ending balance 1,125
Contingencies accrual, of which current $ 1,125