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Trade and other receivables, net - Movements in allowance for trade receivables (Details) - Trade and other receivables - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance For Doubtful Trade Receivables [Roll Forward]      
Beginning balance $ 1,002 $ 643 $ 481
Charge of the year 2,468 758 387
Unused amounts reversed (237) (133) (178)
Used during the year (281) (193) 0
Exchange differences (449) (73) (47)
Ending balance $ 2,503 $ 1,002 $ 643