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Finance income and expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Analysis of income and expense [abstract]    
Employee future benefit plan expense $ (109) $ (189)
Investment income 43,340 19,606
Mark to market and foreign exchange loss on financial assets (12,897) (16,877)
Foreign exchange gain (loss) 821 (4,552)
Government levies (100) (100)
Finance income (loss) and other 31,055 (2,112) [1]
Finance expense $ (1,105) $ (1,265) [1]
[1] Comparative information has been restated due to a discontinued operation (note 7).