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Share capital - National Dream Limited (Details)
1 Months Ended 12 Months Ended
Apr. 02, 2021
shares
Apr. 01, 2021
shares
Dec. 24, 2020
shares
Dec. 11, 2020
shares
Aug. 17, 2020
CNY (¥)
shares
Jan. 14, 2020
CNY (¥)
shares
Dec. 13, 2019
shares
Nov. 27, 2019
USD ($)
shares
Nov. 27, 2019
CNY (¥)
shares
Nov. 26, 2019
USD ($)
shares
Nov. 26, 2019
CNY (¥)
shares
Mar. 11, 2019
USD ($)
shares
Mar. 11, 2019
CNY (¥)
shares
Apr. 30, 2018
USD ($)
Apr. 30, 2018
CNY (¥)
Dec. 31, 2020
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Dec. 31, 2022
shares
Dec. 31, 2017
shares
Share subscription agreement, September 2019                                        
Disclosure of classes of share capital [line items]                                        
Total consideration               $ 5,284,830 ¥ 37,175,000                      
National Dream Limited                                        
Disclosure of classes of share capital [line items]                                        
Total consideration                       $ 13,114,000 ¥ 88,030,000              
Increase in ordinary shares                       1,748,501 1,748,501              
Great Lakes Limited                                        
Disclosure of classes of share capital [line items]                                        
Total consideration                   $ 9,506,400 ¥ 66,877,000                  
Increase in ordinary shares                   1,267,520 1,267,520                  
Blossom View Limited | Share subscription agreement, September 2019                                        
Disclosure of classes of share capital [line items]                                        
Increase in ordinary shares               563,714 563,714                      
Gold Planning Limited | Share subscription agreement, September 2019                                        
Disclosure of classes of share capital [line items]                                        
Increase in ordinary shares               140,930 140,930                      
Ordinary shares                                        
Disclosure of classes of share capital [line items]                                        
Total consideration                           $ 750,000,000 ¥ 4,750,965,000          
Increase in ordinary shares         62,100,000 10,560,000 93,600,000                 72,660,000 3,720,665 99,999,999    
Underwritten public                               1,169,980,661 1,097,320,664 999,999,999 1,169,980,653 900,000,000
Company bought back and cancelled 8 8 3 3                                
ADSs                                        
Disclosure of classes of share capital [line items]                                        
Increase in ordinary shares           3,520,000 31,200,000                          
Underwritten public offerings                                        
Disclosure of classes of share capital [line items]                                        
Total consideration | ¥         ¥ 2,471,951,645                              
Underwritten public         18,000,000                              
Over-allotment options                                        
Disclosure of classes of share capital [line items]                                        
Total consideration | ¥           ¥ 225,727,710                            
Underwritten public         2,700,000