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Property, plant and equipment - Right-of-Use Assets Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets $ 14,119  
Ending, Right-of-use assets 21,424 $ 14,119
Property    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 13,691  
Ending, Right-of-use assets 21,179 13,691
Equipment    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 70  
Ending, Right-of-use assets 34 70
Vehicle    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 358  
Ending, Right-of-use assets 211 358
Cost    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 35,260 29,669
Additions 13,551 5,826
De-recognition (15,084)  
De-recognition   (219)
Reclass 365  
Effect of movements in exchange rates 4 (16)
Ending, Right-of-use assets 34,096 35,260
Cost | Property    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 34,447 28,844
Additions 13,460 5,676
De-recognition (14,731)  
De-recognition   (73)
Reclass 102  
Effect of movements in exchange rates 14 0
Ending, Right-of-use assets 33,292 34,447
Cost | Equipment    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 176 188
Additions 0 0
De-recognition 0  
De-recognition   (11)
Reclass 0  
Effect of movements in exchange rates 0 (1)
Ending, Right-of-use assets 176 176
Cost | Vehicle    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets 637 637
Additions 91 150
De-recognition (353)  
De-recognition   (135)
Reclass 263  
Effect of movements in exchange rates (10) (15)
Ending, Right-of-use assets 628 637
Accumulated depreciation    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets (21,141) (17,652)
Depreciation 3,950 3,532
De-recognition (12,787)  
De-recognition   (68)
Reclass 365  
Effect of movements in exchange rates 3 25
Ending, Right-of-use assets (12,672) (21,141)
Accumulated depreciation | Property    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets (20,757) (17,357)
Depreciation 3,794 3,382
De-recognition (12,434)  
De-recognition   (3)
Reclass 1  
Effect of movements in exchange rates (5) 21
Ending, Right-of-use assets (12,113) (20,757)
Accumulated depreciation | Equipment    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets (106) (72)
Depreciation 35 41
De-recognition 0  
De-recognition   (7)
Reclass 0  
Effect of movements in exchange rates 1 0
Ending, Right-of-use assets (142) (106)
Accumulated depreciation | Vehicle    
Right-of-Use Assets [Roll Forward]    
Beginning, Right-of-use assets (278) (223)
Depreciation 121 109
De-recognition (353)  
De-recognition   (58)
Reclass 364  
Effect of movements in exchange rates 7 4
Ending, Right-of-use assets $ (417) $ (278)