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Equity-settled share-based transactions - Ordinary shares of the Company issues (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Class A ordinary shares | Ordinary shares    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of shares issued for advisors (in shares) 6,148 721,106
Share options | RSUs granted to third parties    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from equity-settled share-based payment transactions $ 0 $ 4,132,000