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Income tax expense - Movement in deferred tax assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income tax expense      
At beginning of the financial year $ 1,644 $ 6,855 $ 6,720
Tax credited/(charged) to profit for the financial year 3,669 (4,801) (254)
Currency effects 8 (410) 389
At end of the financial year $ 5,321 1,644 $ 6,855
Period of time within which deferred tax assets will be recoverable 5 years    
Unutilised tax losses carried forward for which no deferred tax asset recognised   7,100  
Tax effect of unutilised tax losses carried forward for which no deferred tax asset recognised   $ 1,600