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Deferred tax - Deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in deferred tax liability (asset) [abstract]    
At the beginning of the period $ 2,165 $ 2,587
(Credited)/charged to profit or loss (188) (466)
Eliminated on disposal of a subsidiary (1,974)  
Exchange differences 5 44
At the end of the year 8 2,165
Depreciation allowances in excess of the related depreciation    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
At the beginning of the period (2) 304
(Credited)/charged to profit or loss (57) (308)
Eliminated on disposal of a subsidiary 54  
Exchange differences 13 2
At the end of the year 8 (2)
Tax losses recognized    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
At the beginning of the period (124) (293)
(Credited)/charged to profit or loss 0 127
Eliminated on disposal of a subsidiary 132  
Exchange differences (8) 42
At the end of the year 0 (124)
Intangible assets arising from business combination    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
At the beginning of the period 2,291 2,576
(Credited)/charged to profit or loss (131) (285)
Eliminated on disposal of a subsidiary (2,160)  
Exchange differences 0 0
At the end of the year $ 0 $ 2,291