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Provisions for other liabilities - Changes in Provisions for Other Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Movement In Other Provisions [Roll Forward]    
Other provisions, beginning balance $ 4,359 $ 3,172
Additions 4,392 2,339
Used during year (2,483) (407)
Exchange differences (282) (745)
Other provisions, ending balance 5,986 4,359
Labor, legal and other claims    
Movement In Other Provisions [Roll Forward]    
Other provisions, beginning balance 2,864 3,126
Additions 917 890
Used during year (1,028) (407)
Exchange differences (226) (745)
Other provisions, ending balance 2,527 2,864
Others    
Movement In Other Provisions [Roll Forward]    
Other provisions, beginning balance 1,495 46
Additions 3,475 1,449
Used during year (1,455) 0
Exchange differences (56) 0
Other provisions, ending balance $ 3,459 $ 1,495