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Convertible redeemable preferred shares - Issuances (Details)
1 Months Ended
Oct. 27, 2020
¥ / shares
shares
Oct. 27, 2020
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shares
Aug. 12, 2019
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shares
Jun. 05, 2019
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shares
Aug. 06, 2018
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shares
Jul. 03, 2018
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shares
Jul. 03, 2018
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Dec. 27, 2017
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shares
Aug. 14, 2017
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shares
May 18, 2017
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shares
Nov. 30, 2023
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shares
Oct. 31, 2022
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Oct. 31, 2020
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shares
Oct. 31, 2020
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shares
Aug. 31, 2019
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shares
Jun. 30, 2019
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shares
Aug. 31, 2018
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shares
Jul. 31, 2018
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Jul. 31, 2018
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Dec. 31, 2017
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Aug. 31, 2017
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May 31, 2017
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Apr. 30, 2016
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shares
Series A Preferred Shares                                              
Convertible redeemable preferred shares                                              
Issue price per share | ¥ / shares                                             ¥ 0.3078
Number of shares issued                                             58,480,000
Series A+ Preferred Shares                                              
Convertible redeemable preferred shares                                              
Issue price per share | ¥ / shares                   ¥ 0.3420                       ¥ 0.3420  
Number of shares issued                   84,480,000                       84,480,000  
Series B Preferred Shares                                              
Convertible redeemable preferred shares                                              
Issue price per share | ¥ / shares                 ¥ 0.3848                       ¥ 0.3848    
Number of shares issued                 649,760,000                       649,760,000    
Series B+ Preferred Shares                                              
Convertible redeemable preferred shares                                              
Issue price per share | ¥ / shares               ¥ 0.6733                       ¥ 0.6733      
Number of shares issued               277,730,000                       277,730,000      
Series C1 Preferred Shares                                              
Convertible redeemable preferred shares                                              
Issue price per share | (per share)           ¥ 0.9334 $ 0.1404                     ¥ 0.9334 $ 0.1404        
Number of shares issued           604,820,600 604,820,600                     604,820,600 604,820,600        
Series C2 Preferred Shares                                              
Convertible redeemable preferred shares                                              
Issue price per share | ¥ / shares         ¥ 0.9334                       ¥ 0.9334            
Number of shares issued         289,379,800                       289,379,800            
Series D1 Preferred Shares                                              
Convertible redeemable preferred shares                                              
Issue price per share | $ / shares       $ 0.1899                       $ 0.1899              
Number of shares issued       705,523,600                       705,523,600              
Series D2 Preferred Shares                                              
Convertible redeemable preferred shares                                              
Issue price per share | $ / shares     $ 0.1899                       $ 0.1899                
Number of shares issued     105,302,000                       105,302,000                
Series E Preferred Shares                                              
Convertible redeemable preferred shares                                              
Issue price per share | (per share) ¥ 2.3119 $ 0.3425                     ¥ 2.3119 $ 0.3425                  
Number of shares issued 803,222,500 803,222,500                     803,222,500 803,222,500                  
Series F Preferred Shares                                              
Convertible redeemable preferred shares                                              
Issue price per share | $ / shares                     $ 0.5659 $ 0.5659                      
Number of shares issued                     392,013,413 392,013,413