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Finance income and expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Analysis of income and expense [abstract]    
Employee future benefit plan expense (note 20) $ (131) $ (164)
Pension administration expense (120) (110)
Investment income 4,043 1,436
Other income (300) (255)
Mark to market and foreign exchange loss on financial assets (notes 14 & 31) (9,024) 0
Foreign exchange gain (loss) (1,336) 4,875
Government levies (1,945) (1,500)
Finance income and other (8,813) 4,282
Finance expense $ (1,294) $ (1,303)