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Income tax benefit/(expense) - Additional information (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
Income Taxes Disclosure            
Statutory tax rate (as a percent)     25.00% 25.00% 25.00% 25.00%
Profits tax ¥ 455,368   ¥ 9,762   ¥ (62,147)  
Estimated assessable profit ¥ (249,338)   ¥ (210,341)   ¥ (857,337)  
Income Tax Expense On Undistributed Earnings | $   $ 0   $ 0    
PRC            
Income Taxes Disclosure            
Statutory tax rate (as a percent) 25.00% 25.00% 25.00% 25.00% 25.00%  
Preferential tax rate 15.00% 15.00% 15.00% 15.00% 15.00%  
PRC | Bottom of range [Member]            
Income Taxes Disclosure            
Withholding tax rate 5.00% 5.00%        
PRC | Top of range [Member]            
Income Taxes Disclosure            
Withholding tax rate 10.00% 10.00%        
China (Guangdong) pilot free Trade Zone Qianhai & Shekou area of Shenzhen            
Income Taxes Disclosure            
Reduced income tax rate 15.00% 15.00%        
Hongkong            
Income Taxes Disclosure            
Statutory tax rate (as a percent) 16.50% 16.50% 16.50% 16.50% 16.50%  
Other Jurisdictions | Top of range [Member]            
Income Taxes Disclosure            
Statutory tax rate (as a percent) 25.00% 25.00% 25.00% 25.00% 25.00%