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Trade and other payables (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]    
Trade accounts payable $ 13,689 $ 9,070
Compensation payable 15,830 14,417
Other liabilities 9,130 5,306
Taxes payable 906 1,084
Trade and other payables $ 39,555 $ 29,877