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Property, plant and equipment - Right-of-use Assets Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning, Right-of-use assets $ 12,774  
Ending, Right-of-use assets 12,206 $ 12,774
Property    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning, Right-of-use assets 12,537  
Ending, Right-of-use assets 11,837 12,537
Equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning, Right-of-use assets 121  
Ending, Right-of-use assets 139 121
Vehicle    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning, Right-of-use assets 116  
Ending, Right-of-use assets 230 116
Cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning, Right-of-use assets 25,022 24,794
Additions 2,013 156
Additions through acquisition 174  
Transfer 159  
De-recognition   (88)
Effect of movements in exchange rates (76) 160
Ending, Right-of-use assets 26,974 25,022
Cost | Property    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning, Right-of-use assets 24,665 24,568
Additions 1,967 0
Additions through acquisition 0  
Transfer 137  
De-recognition   (46)
Effect of movements in exchange rates (68) 143
Ending, Right-of-use assets 26,427 24,665
Cost | Equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning, Right-of-use assets 149 84
Additions 46 102
Additions through acquisition 0  
Transfer 22  
De-recognition   (42)
Effect of movements in exchange rates 2 5
Ending, Right-of-use assets 175 149
Cost | Vehicle    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning, Right-of-use assets 208 142
Additions 0 54
Additions through acquisition 174  
Transfer 0  
De-recognition   0
Effect of movements in exchange rates (10) 12
Ending, Right-of-use assets 372 208
Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning, Right-of-use assets (12,248) (9,704)
Transfer 159  
Depreciation 2,715 2,559
De-recognition   (61)
Effect of movements in exchange rates (36) 46
Ending, Right-of-use assets (14,768) (12,248)
Accumulated depreciation | Property    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning, Right-of-use assets (12,128) (9,647)
Transfer 137  
Depreciation 2,633 2,488
De-recognition   (46)
Effect of movements in exchange rates (34) 39
Ending, Right-of-use assets (14,590) (12,128)
Accumulated depreciation | Equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning, Right-of-use assets (28) (17)
Transfer 22  
Depreciation 28 25
De-recognition   (15)
Effect of movements in exchange rates 2 1
Ending, Right-of-use assets (36) (28)
Accumulated depreciation | Vehicle    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning, Right-of-use assets (92) (40)
Transfer 0  
Depreciation 54 46
De-recognition   0
Effect of movements in exchange rates (4) 6
Ending, Right-of-use assets $ (142) $ (92)