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Trade and other receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Trade and other receivables [abstract]    
Trade receivables $ 4,740 $ 2,761
Value added taxes receivable 3,219 1,916
Other receivables 249 425
Trade and other receivables $ 8,208 $ 5,102