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Provisions and other liabilities - Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in other provisions [abstract]        
Provisions and other current liabilities, beginning balance $ 9,700 $ 7,432    
Provisions made during the year 5,920 5,563    
Provisions used/paid during the year (1,969) (2,329)    
Provisions reversed during the year (210) (1,279)    
Effect of movements in exchange rates (336) 313    
Provisions and other current liabilities, ending balance 13,105 9,700    
Current provisions     $ 9,243 $ 5,447
Non-current provisions     3,862 4,253
Provisions and other current liabilities 9,700 7,432 13,105 9,700
Restructuring provision        
Reconciliation of changes in other provisions [abstract]        
Provisions and other current liabilities, beginning balance 248 813    
Provisions made during the year 509 912    
Provisions used/paid during the year (560) (1,424)    
Provisions reversed during the year (2) (81)    
Effect of movements in exchange rates (4) 28    
Provisions and other current liabilities, ending balance 191 248    
Current provisions     191 248
Non-current provisions     0 0
Provisions and other current liabilities 248 813 191 248
Warranty provision        
Reconciliation of changes in other provisions [abstract]        
Provisions and other current liabilities, beginning balance 5,199 2,755    
Provisions made during the year 5,474 4,540    
Provisions used/paid during the year (1,409) (905)    
Provisions reversed during the year (208) (1,198)    
Effect of movements in exchange rates (4) 7    
Provisions and other current liabilities, ending balance 9,052 5,199    
Current provisions     9,052 5,199
Non-current provisions     0 0
Provisions and other current liabilities 5,199 2,755 9,052 5,199
Other current liabilities        
Reconciliation of changes in other provisions [abstract]        
Provisions and other current liabilities, beginning balance 4,253 3,864    
Provisions made during the year (63) 111    
Provisions used/paid during the year 0 0    
Provisions reversed during the year 0 0    
Effect of movements in exchange rates (328) 278    
Provisions and other current liabilities, ending balance 3,862 4,253    
Current provisions     0 0
Non-current provisions     3,862 4,253
Provisions and other current liabilities $ 4,253 $ 3,864 $ 3,862 $ 4,253