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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance For Doubtful Trade Receivables [Roll Forward]      
Beginning balance $ 2,503 $ 1,002 $ 643
Charge of the year 3,656 2,468 758
Acquisition of subsidiary 46 0 0
Unused amounts reversed (1,314) (237) (133)
Used during the year (48) (281) (193)
Exchange differences (1,070) (449) (73)
Ending balance $ 3,773 $ 2,503 $ 1,002