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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance For Doubtful Trade Receivables [Roll Forward]      
Beginning balance $ 3,773 $ 2,503 $ 1,002
Charge of the year 2,192 3,656 2,468
Acquisition of subsidiary 0 46 0
Unused amounts reversed (769) (1,314) (237)
Used during the year (446) (48) (281)
Exchange differences (785) (1,070) (449)
Ending balance $ 3,965 $ 3,773 $ 2,503