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Share capital (Details)
1 Months Ended 12 Months Ended 48 Months Ended
Aug. 17, 2020
shares
Jan. 14, 2020
shares
Dec. 13, 2019
shares
Apr. 30, 2018
CNY (¥)
item
Apr. 30, 2018
USD ($)
item
$ / shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2024
CNY (¥)
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2017
$ / shares
Issued                                  
Ending balance, equity | ¥                       ¥ 2,503,943,000          
Number of investors | item       12 12                        
Ordinary shares                                  
Authorized                                  
Ordinary shares par value per share | $ / shares                 $ 0.00001   $ 0.00001   $ 0.00001 $ 0.00001 $ 0.00001 $ 0.00001 $ 0.00001
Authorized shares                           5,000,000,000 5,000,000,000 5,000,000,000  
Authorized share capital | $                           $ 50,000 $ 50,000 $ 50,000  
Issued                                  
Issued shares at beginning of period           1,097,320,664 1,097,320,664 999,999,999 999,999,999 900,000,000 900,000,000 1,169,980,661 1,169,980,661        
Increase in ordinary shares 62,100,000 10,560,000 93,600,000     72,660,000 72,660,000 3,720,665 3,720,665 99,999,999 99,999,999            
Newly issued ordinary shares upon initial public offering               93,600,000 93,600,000                
Issued shares at end of period           1,169,980,661 1,169,980,661 1,097,320,664 1,097,320,664 999,999,999 999,999,999 1,169,980,653 1,169,980,653        
Surrendered ordinary shares           (3) (3)         (8) (8)        
Surrendered ordinary value           ¥ 0 $ 0                    
Beginning balance, equity           72,975 10,973 ¥ 66,169 $ 10,000 ¥ 59,838 $ 9,000 ¥ 78,008 $ 11,700        
Issuance of ordinary shares           5,033 727 257 37 6,331 1,000            
Issuance of ordinary shares upon initial public offering               6,549 936                
Ending balance, equity           ¥ 78,008 $ 11,700 ¥ 72,975 $ 10,973 ¥ 66,169 $ 10,000 ¥ 78,008 $ 11,700        
Total consideration       ¥ 4,750,965,000 $ 750,000,000                        
Price per share (in USD per share) | $ / shares         $ 7.5