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Contract liabilities (Tables)
 12 Months Ended
Dec. 31, 2025
Contract liabilities [abstract]  
Schedule of contract liabilities
20252024
Contract liabilities$3,086 $6,491 
Movement in contract liabilities is as follows:
20252024
Balance at January 1$6,491 $6,111 
Revenue recognized (Note)(71,733)(9,089)
Receipt from customers upon entering sales contracts68,391 9,469 
Eliminated on disposal of a subsidiary(63)— 
Balance at December 31$3,086 $6,491 
Note:    At December 31, 2025 and 2024, the amount of $4,832 and $1,126, respectively, recognized as revenue from the expiration of unused test kits, which had previously been recorded as contract liabilities.