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Share-based compensation - Summary of the restricted share units activity (Details) - Restricted share units - $ / shares
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Share-based compensation      
Beginning, RSU 4,281,556 5,148,398 7,272,469
Granted 4,972,103 2,732,585 2,787,407
Forfeited (292,445) (459,733) (1,365,256)
Vested (3,214,736) (3,139,694) (3,546,222)
Ending, RSU 5,746,478 4,281,556 5,148,398
Expected to vest RSU 5,473,862    
Beginning ,Weighted $ 4.4037 $ 4.7664 $ 7.8046
Granted 1.3082 4.1986 2.8824
Forfeited 3.4153 4.6775 7.2654
Vested 3.0354 4.7799 8.554
Ending ,Weighted 2.5411 $ 4.4037 $ 4.7664
Expected to vest Weighted $ 2.4913