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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
shares
Jan. 14, 2020
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, 2024
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]                                        
Underwritten public         18,000,000                              
Over-allotment options                                        
Disclosure of classes of share capital [line items]                                        
Underwritten public         2,700,000