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Discontinued operations - Other income and other gain (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of analysis of single amount of discontinued operations [line items]      
Bank interest income $ 1,042 $ 1,846 $ 3,570
Net foreign exchange (loss)/gain (837) 7 376
Sundry income 105 153 79
Other income and other net gain/(losses) 614 2,006 4,133
Discontinued operations      
Disclosure of analysis of single amount of discontinued operations [line items]      
Bank interest income 50 193 373
Net foreign exchange (loss)/gain 283 314 (71)
Sundry income 4,701 278 362
Other income and other net gain/(losses) 5,034 785 664
Discontinued operations | Prevention and diagnostics - COVID-19 related and EMEA operations      
Disclosure of analysis of single amount of discontinued operations [line items]      
Bank interest income 0 0 19
Net foreign exchange (loss)/gain (4) 1 (25)
Sundry income 4,594 45 296
Other income and other net gain/(losses) 4,590 46 290
Discontinued operations | ACT genomics      
Disclosure of analysis of single amount of discontinued operations [line items]      
Bank interest income 50 193 354
Net foreign exchange (loss)/gain 287 313 (46)
Sundry income 107 233 66
Other income and other net gain/(losses) $ 444 $ 739 $ 374