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Ordinary shares (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 15, 2023
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
$ / shares
shares
Dec. 31, 2021
Apr. 26, 2021
$ / shares
shares
Ordinary shares            
Ordinary shares, shares authorized   496,253,373,300   496,253,373,300   95,000
Ordinary shares, par value (in dollars per share) | $ / shares   $ 0.0000001   $ 0.0000001   $ 0.0000001
Ordinary shares, shares issued   5,621,490,964   1,218,621,800    
Ordinary shares, shares outstanding   5,621,490,964   1,218,621,800    
Class A Ordinary Shares            
Ordinary shares            
Number of underlying shares represented by one ADS   35   35 35  
IPO | ADS            
Ordinary shares            
Shares issued 4,000,000          
Net proceeds   $ 57,660 ¥ 409,282      
IPO | Class A Ordinary Shares            
Ordinary shares            
Ordinary shares, par value (in dollars per share) | $ / shares $ 0.0000001          
Shares issued 140,000,000          
Number of underlying shares represented by one ADS 35          
Previously reported            
Ordinary shares            
Ordinary shares, shares authorized   496,195,831,500   496,195,831,500    
Ordinary shares, par value (in dollars per share) | $ / shares   $ 0.0000001   $ 0.0000001    
Ordinary shares, shares issued   5,621,490,964   1,161,080,000    
Ordinary shares, shares outstanding   5,621,490,964   1,161,080,000