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Convertible Redeemable Preferred Shares - Re-designation (Details)
 1 Months Ended 4 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
shares
Aug. 31, 2019
shares
Apr. 30, 2019
USD ($)
shares
Apr. 30, 2019
CNY (¥)
shares
Mar. 31, 2019
CNY (¥)
shares
Dec. 31, 2016
shares
Nov. 30, 2016
shares
May 31, 2016
shares
Mar. 31, 2016
shares
Sep. 30, 2015
shares
Jun. 30, 2012
shares
Nov. 30, 2011
shares
Jan. 31, 2018
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2017
CNY (¥)
shares
Convertible Redeemable Preferred Shares                                
Total amount | ¥                             ¥ 100,000,000 ¥ 152,000,000
Preferred shares issued (in shares)                           39,999,999 65,427,000 99,449,000
Series B-3 Convertible Redeemable Preferred Stock                                
Convertible Redeemable Preferred Shares                                
Share issuance upon initial public offering, net of issuance costs of US$ (in shares)   56,105,000 17,215,818 17,215,818 10,027,455   7,220,212     12,141,515            
Total amount | ¥       ¥ 30,896,752 ¥ 27,140,000                      
Difference between the fair value and the par value of the ordinary shares | ¥       ¥ 29,956,000                        
Difference between the fair value of the preferred shares and the fair value of the ordinary shares | $     $ 11,230,000                          
Re-designation of ordinary shares | ¥                           ¥ (29,966,000)    
Series B-4 Convertible Redeemable Preferred Stock                                
Convertible Redeemable Preferred Shares                                
Share issuance upon initial public offering, net of issuance costs of US$ (in shares)   20,982,000 11,643,239 11,643,239   2,334,688     7,004,073              
Total amount | ¥       ¥ 36,756,000                        
Difference between the fair value and the par value of the ordinary shares | ¥       ¥ 20,261,000                        
Difference between the fair value of the preferred shares and the fair value of the ordinary shares | $     $ 15,554,000                          
Re-designation of ordinary shares | ¥                           (20,268,000)    
Series A-1, A-2, B-1, B-2 and B-3 convertible redeemable preferred shares                                
Convertible Redeemable Preferred Shares                                
Share issuance upon initial public offering, net of issuance costs of US$ (in shares)   67,311,809                            
Re-designation of ordinary shares | ¥                           (309,984,000)    
Series A-1 Convertible Redeemable Preferred Stock                                
Convertible Redeemable Preferred Shares                                
Share issuance upon initial public offering, net of issuance costs of US$ (in shares)   65,307,000                   62,273,127        
Series A-2 Convertible Redeemable Preferred Stock                                
Convertible Redeemable Preferred Shares                                
Share issuance upon initial public offering, net of issuance costs of US$ (in shares)   101,261,000                 81,008,717          
Series B-1 Convertible Redeemable Preferred Stock                                
Convertible Redeemable Preferred Shares                                
Share issuance upon initial public offering, net of issuance costs of US$ (in shares)   250,302,000               200,241,529            
Series B-2 Convertible Redeemable Preferred Stock                                
Convertible Redeemable Preferred Shares                                
Share issuance upon initial public offering, net of issuance costs of US$ (in shares)   14,593,000           11,674,379                
Series C-1 Convertible Redeemable Preferred Stock                                
Convertible Redeemable Preferred Shares                                
Share issuance upon initial public offering, net of issuance costs of US$ (in shares)   164,876,000                     164,876,000      
Preferred shares issued (in shares)                             65,427,000 99,449,000
Series C-2 Convertible Redeemable Preferred Stock                                
Convertible Redeemable Preferred Shares                                
Re-designation of ordinary shares | ¥                           ¥ (36,977,000)    
Re-designation of ordinary shares into convertible redeemable preferred shares (in shares)   12,545,000                            
Series D Convertible Redeemable Preferred Stock                                
Convertible Redeemable Preferred Shares                                
Preferred shares issued (in shares) 39,999,999                         39,999,999    
Aggregate Purchase Price | $ $ 24,000,000                              
Restricted share units | Series A-1, A-2, B-1, B-2 and B-3 convertible redeemable preferred shares                                
Convertible Redeemable Preferred Shares                                
Share issuance upon initial public offering, net of issuance costs of US$ (in shares)   12,927,101                            
Ordinary shares | Series B-3 Convertible Redeemable Preferred Stock                                
Convertible Redeemable Preferred Shares                                
Re-designation of ordinary shares | ¥                           ¥ (10,000)    
Ordinary shares | Series B-4 Convertible Redeemable Preferred Stock                                
Convertible Redeemable Preferred Shares                                
Re-designation of ordinary shares | ¥                           (7,000)    
Ordinary shares | Series A-1, A-2, B-1, B-2 and B-3 convertible redeemable preferred shares                                
Convertible Redeemable Preferred Shares                                
Share issuance upon initial public offering, net of issuance costs of US$ (in shares)   15,553,793                            
Re-designation of ordinary shares | ¥                           (11,000)    
Ordinary shares | Series C-2 Convertible Redeemable Preferred Stock                                
Convertible Redeemable Preferred Shares                                
Re-designation of ordinary shares | ¥                           ¥ (9,000)