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Right-of-use assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Right-of-use assets    
Opening net book value $ 818 $ 1,116
Foreign exchange 15 (70)
Depreciation (217) (228)
Closing net book value $ 616 818
Lease agreement extension 5 years  
Cost    
Right-of-use assets    
Opening net book value $ 1,679  
Closing net book value 1,679 1,679
Accumulated depreciation    
Right-of-use assets    
Opening net book value (861)  
Closing net book value $ (1,063) $ (861)