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Related parties - Transactions with key management personnel (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of transactions between related parties [line items]      
Sales to an equity-accounted investee (Note(a)) $ 0 $ 120 $ 702
Services recharge received from an equity-accounted investee (Note(b)) 52 0 0
Services recharge received from a related party (Note(c)) 28 31 $ 13
Amounts due from related companies 4 3  
Services recharge      
Disclosure of transactions between related parties [line items]      
Amounts due from related companies 0 3  
Other related parties | Sale of goods      
Disclosure of transactions between related parties [line items]      
Amounts due from equity-accounted investees 0 127  
Other related parties | Rendering services      
Disclosure of transactions between related parties [line items]      
Amounts due from equity-accounted investees $ 4 $ 0