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Financial instruments - fair values and risk management - Reconciliation from the opening balances to the closing balances for financial assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Measurement of fair values    
Financial asset $ 16,115 $ 32,883
Level 3    
Measurement of fair values    
Financial asset $ 0 $ 0