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Property, plant and equipment - Right-of-use assets (Details) - Right-of-use assets - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about property, plant and equipment [line items]    
Right-of-use assets $ 1,495 $ 5,119
Properties leased for own use, carried at depreciated cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Right-of-use assets 1,491 5,101
Office equipment, carried at depreciated cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Right-of-use assets $ 4 $ 18