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Share-based compensation - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Apr. 30, 2018
2018 Equity Incentive Plan | Class A ordinary shares          
Share-based compensation          
Ordinary shares Held in trust         51,624,000
Share-Based Compensation Arrangement By Share-Based Payment Award Cumulative Annual Increase Percentage 15.00%        
Share-based compensation arrangement by share-based payment award, percentage of outstanding stock maximum 3.00%        
Employee Stock Option          
Share-based compensation          
Unrecognized compensation expense related to share options   $ 0      
Restricted Share Units          
Share-based compensation          
Restricted share units granted   229,907,010 494,060,175 102,323,925  
Unrecognized compensation expense   $ 48,664      
Weighted-average period for recognization of unrecognized compensation expense related to share options   38 months      
Fair value of vested shares   $ 28,977 $ 16,415 $ 30,812  
Fair value of unvested shares   $ 53,561      
Restricted Share Units | Amended 2018 Plan          
Share-based compensation          
Restricted share units granted   229,907,010      
Requisite service period   5 years