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Property, plant and equipment - Right-of-Use Assets Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets $ 12,017  
Ending, Right-of-use assets 14,119 $ 12,017
Property    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 11,487  
Ending, Right-of-use assets 13,691 11,487
Equipment    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 116  
Ending, Right-of-use assets 70 116
Vehicle    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 414  
Ending, Right-of-use assets 358 414
Cost    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 29,669 26,974
Additions 5,826 3,049
De-recognition (219)  
De-recognition   (25)
Transfer   (341)
Effect of movements in exchange rates (16) 12
Ending, Right-of-use assets 35,260 29,669
Cost | Property    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 28,844 26,427
Additions 5,676 2,746
De-recognition (73)  
De-recognition   0
Transfer   (341)
Effect of movements in exchange rates 0 12
Ending, Right-of-use assets 34,447 28,844
Cost | Equipment    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 188 175
Additions 0 13
De-recognition (11)  
De-recognition   0
Transfer   0
Effect of movements in exchange rates (1) 0
Ending, Right-of-use assets 176 188
Cost | Vehicle    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 637 372
Additions 150 290
De-recognition (135)  
De-recognition   (25)
Transfer   0
Effect of movements in exchange rates (15) 0
Ending, Right-of-use assets 637 637
Accumulated depreciation    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets (17,652) (14,768)
Depreciation 3,532 3,231
De-recognition (68)  
De-recognition   (6)
Transfer   (341)
Effect of movements in exchange rates 25 0
Ending, Right-of-use assets (21,141) (17,652)
Accumulated depreciation | Property    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets (17,357) (14,590)
Depreciation 3,382 3,108
De-recognition (3)  
De-recognition   0
Transfer   (341)
Effect of movements in exchange rates 21 0
Ending, Right-of-use assets (20,757) (17,357)
Accumulated depreciation | Equipment    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets (72) (36)
Depreciation 41 36
De-recognition (7)  
De-recognition   0
Transfer   0
Effect of movements in exchange rates 0 0
Ending, Right-of-use assets (106) (72)
Accumulated depreciation | Vehicle    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets (223) (142)
Depreciation 109 87
De-recognition (58)  
De-recognition   (6)
Transfer   0
Effect of movements in exchange rates 4 0
Ending, Right-of-use assets $ (278) $ (223)