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Ordinary shares and treasury shares (Details)
$ / shares in Units, ¥ in Thousands
 12 Months Ended
Jul. 15, 2024
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
$ / shares
Dec. 31, 2023
CNY (¥)
shares
Dec. 31, 2022
shares
Dec. 20, 2022
$ / shares
Ordinary Share                
Amount of shares authorized | $   $ 50,000,000            
Ordinary shares, shares authorized (in shares)     10,000,000,000 10,000,000,000        
Par value per share of shares sold back by four members of the Group's management | $ / shares               $ 0.000005
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares to be Repurchased Next Year 4,500,000              
Share Repurchase Program, Authorized, Amount | $       $ 20,000,000        
Share Repurchase Program, Authorized, Number of Shares     503,000 503,000        
Treasury shares, at cost     ¥ 7,435 $ 1,019,000   ¥ 0    
Class A Ordinary Shares                
Ordinary Share                
Ordinary shares, shares authorized (in shares)     8,000,000,000 8,000,000,000   8,000,000,000    
Par value per share of shares sold back by four members of the Group's management | $ / shares       $ 0.000005 $ 0.000005      
Ordinary shares, shares issued (in shares)     291,166,110 291,166,110   288,989,049 288,434,474  
Ordinary shares, shares outstanding (in shares)     291,166,110 291,166,110   288,989,049    
Class A Ordinary Shares | Share Incentive 2022 Plan                
Ordinary Share                
Ordinary shares, shares issued (in shares)     7,180,061 7,180,061   554,575    
Class B Ordinary Shares                
Ordinary Share                
Ordinary shares, shares authorized (in shares)     1,000,000,000 1,000,000,000   1,000,000,000,000    
Par value per share of shares sold back by four members of the Group's management | $ / shares       $ 0.000005 $ 0.000005      
Ordinary shares, shares issued (in shares)     48,960,916 48,960,916   48,960,916    
Ordinary shares, shares outstanding (in shares)     48,960,916 48,960,916   48,960,916 48,960,916  
Designated Shares                
Ordinary Share                
Ordinary shares, shares authorized (in shares)     1,000,000,000 1,000,000,000        
Par value per share of shares sold back by four members of the Group's management | $ / shares       $ 0.000005