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Property, plant and equipment - Right-of -use assets recognized in Profit & loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]      
- right-of-use assets $ 1,568 $ 1,212 $ 771
Interest on lease liabilities (notes 8(a) and 10(c)) 258 203 242
Expense relating to short-term leases or leases of low-value assets 284 366 137
Aggregate continuing and discontinued operations      
Disclosure of detailed information about property, plant and equipment [line items]      
- right-of-use assets 1,936 2,052 2,786
Aggregate continuing and discontinued operations | Properties leased for own use      
Disclosure of detailed information about property, plant and equipment [line items]      
- right-of-use assets 1,922 2,038 2,772
Aggregate continuing and discontinued operations | Office equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
- right-of-use assets $ 14 $ 14 $ 14