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Convertible Redeemable Preferred Shares - Preferred Shares activities (Details)
¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2019
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2017
CNY (¥)
shares
Convertible Redeemable Preferred Shares          
Balance at beginning of year | ¥     ¥ 808,601 ¥ 588,541 ¥ 433,707
Balance at the beginning of the year (in shares)   548,774,240 548,774,240 483,347,240 383,898,240
Issuance of Preferred Shares | ¥     ¥ 169,750 ¥ 100,000 ¥ 152,000
Issuance of Preferred Shares (in shares)   39,999,999 39,999,999 65,427,000 99,449,000
Accretions of Preferred Shares to redemption value   $ 449,130   ¥ 120,060 ¥ 2,834
Re-designation of Series A-1 into Series B-3 preferred shares   (3,848) ¥ (26,787)    
Re-designation of ordinary shares into Series B-3 preferred shares   $ (5,917) ¥ (41,196)    
Re-designation of ordinary shares into Series B-3 preferred shares (in shares)   17,215,818 17,215,818    
Re-designation of ordinary shares into Series B-4 preferred shares   $ (5,146) ¥ (35,822)    
Re-designation of ordinary shares into Series B-4 preferred shares (in shares)   11,643,239 11,643,239    
Re-designation of ordinary shares into Series A-1, A-2, B-1, B-2, B-3 preferred shares, and issuance of Series A-1, A-2, B-1, B-2, B-3 preferred shares   $ (44,526) ¥ (309,984)    
Re-designation of ordinary shares into Series A-1, A-2, B-1, B-2, B-3 preferred shares, and issuance of Series A-1, A-2, B-1, B-2, B-3 preferred shares (in shares)   95,792,703 95,792,703    
Re-designation of ordinary shares into Series C-2 preferred shares   $ (5,311) ¥ (36,977)    
Re-designation of ordinary shares into Series C-2 preferred shares (in shares)   12,545,000 12,545,000    
Conversion and re-designation of Pre-IPO Preferred Shares | ¥     ¥ (1,878,247)    
Conversion and re-designation of Pre-IPO Preferred Shares (in shares)   (725,970,999) (725,970,999)    
Balance at end of year | ¥       ¥ 808,601 ¥ 588,541
Balance at the end of the year (in shares)       548,774,240 483,347,240
Series A-1 Convertible Redeemable Preferred Stock          
Convertible Redeemable Preferred Shares          
Balance at beginning of year | ¥     ¥ 681 ¥ 681 ¥ 681
Balance at the beginning of the year (in shares) 65,307,000 62,273,127 62,273,127 62,273,127 62,273,127
Re-designation of Series A-1 into Series B-3 preferred shares | ¥     ¥ (110)    
Re-designation of Series A-1 into Series B-3 preferred shares (in shares)   (10,027,455) (10,027,455)    
Re-designation of ordinary shares into Series A-1, A-2, B-1, B-2, B-3 preferred shares, and issuance of Series A-1, A-2, B-1, B-2, B-3 preferred shares | ¥     ¥ 41,233    
Re-designation of ordinary shares into Series A-1, A-2, B-1, B-2, B-3 preferred shares, and issuance of Series A-1, A-2, B-1, B-2, B-3 preferred shares (in shares)   13,061,328 13,061,328    
Conversion and re-designation of Pre-IPO Preferred Shares | ¥     ¥ (41,804)    
Conversion and re-designation of Pre-IPO Preferred Shares (in shares)   (65,307,000) (65,307,000)    
Balance at end of year | ¥       ¥ 681 ¥ 681
Balance at the end of the year (in shares)   0 0 62,273,127 62,273,127
Series A-2 Convertible Redeemable Preferred Stock          
Convertible Redeemable Preferred Shares          
Balance at beginning of year | ¥     ¥ 13,500 ¥ 12,169 ¥ 10,169
Balance at the beginning of the year (in shares) 101,261,000 81,008,717 81,008,717 81,008,717 81,008,717
Accretions of Preferred Shares to redemption value | ¥       ¥ 1,331 ¥ 2,000
Re-designation of ordinary shares into Series A-1, A-2, B-1, B-2, B-3 preferred shares, and issuance of Series A-1, A-2, B-1, B-2, B-3 preferred shares | ¥     ¥ 63,994    
Re-designation of ordinary shares into Series A-1, A-2, B-1, B-2, B-3 preferred shares, and issuance of Series A-1, A-2, B-1, B-2, B-3 preferred shares (in shares)   20,252,283 20,252,283    
Conversion and re-designation of Pre-IPO Preferred Shares | ¥     ¥ (77,494)    
Conversion and re-designation of Pre-IPO Preferred Shares (in shares)   (101,261,000) (101,261,000)    
Balance at end of year | ¥       ¥ 13,500 ¥ 12,169
Balance at the end of the year (in shares)   0 0 81,008,717 81,008,717
Series B-1 Convertible Redeemable Preferred Stock          
Convertible Redeemable Preferred Shares          
Balance at beginning of year | ¥     ¥ 388,145 ¥ 296,857 ¥ 296,857
Balance at the beginning of the year (in shares) 250,302,000 200,241,529 200,241,529 200,241,529 200,241,529
Accretions of Preferred Shares to redemption value   $ 363,100   ¥ 91,288  
Re-designation of ordinary shares into Series A-1, A-2, B-1, B-2, B-3 preferred shares, and issuance of Series A-1, A-2, B-1, B-2, B-3 preferred shares | ¥     ¥ 163,340    
Re-designation of ordinary shares into Series A-1, A-2, B-1, B-2, B-3 preferred shares, and issuance of Series A-1, A-2, B-1, B-2, B-3 preferred shares (in shares)   50,060,471 50,060,471    
Conversion and re-designation of Pre-IPO Preferred Shares | ¥     ¥ (914,585)    
Conversion and re-designation of Pre-IPO Preferred Shares (in shares)   (250,302,000) (250,302,000)    
Balance at end of year | ¥       ¥ 388,145 ¥ 296,857
Balance at the end of the year (in shares)   0 0 200,241,529 200,241,529
Series B-2 Convertible Redeemable Preferred Stock          
Convertible Redeemable Preferred Shares          
Balance at beginning of year | ¥     ¥ 45,000 ¥ 45,000 ¥ 45,000
Balance at the beginning of the year (in shares) 14,593,000 11,674,379 11,674,379 11,674,379 11,674,379
Accretions of Preferred Shares to redemption value | $   $ 1,722      
Re-designation of ordinary shares into Series A-1, A-2, B-1, B-2, B-3 preferred shares, and issuance of Series A-1, A-2, B-1, B-2, B-3 preferred shares | ¥     ¥ 10,044    
Re-designation of ordinary shares into Series A-1, A-2, B-1, B-2, B-3 preferred shares, and issuance of Series A-1, A-2, B-1, B-2, B-3 preferred shares (in shares)   2,918,621 2,918,621    
Conversion and re-designation of Pre-IPO Preferred Shares | ¥     ¥ (53,322)    
Conversion and re-designation of Pre-IPO Preferred Shares (in shares)   (14,593,000) (14,593,000)    
Balance at end of year | ¥       ¥ 45,000 ¥ 45,000
Balance at the end of the year (in shares)   0 0 11,674,379 11,674,379
Series B-3 Convertible Redeemable Preferred Stock          
Convertible Redeemable Preferred Shares          
Balance at beginning of year | ¥     ¥ 48,016 ¥ 45,000 ¥ 45,000
Balance at the beginning of the year (in shares) 56,105,000 19,361,727 19,361,727 19,361,727 19,361,727
Accretions of Preferred Shares to redemption value   $ 57,521   ¥ 3,016  
Re-designation of Series A-1 into Series B-3 preferred shares | ¥     ¥ 26,897    
Re-designation of Series A-1 into Series B-3 preferred shares (in shares)   10,027,455 10,027,455    
Re-designation of ordinary shares into Series B-3 preferred shares | ¥     ¥ 41,196    
Re-designation of ordinary shares into Series B-3 preferred shares (in shares)   17,215,818 17,215,818    
Re-designation of ordinary shares into Series A-1, A-2, B-1, B-2, B-3 preferred shares, and issuance of Series A-1, A-2, B-1, B-2, B-3 preferred shares | ¥     ¥ 31,373    
Re-designation of ordinary shares into Series A-1, A-2, B-1, B-2, B-3 preferred shares, and issuance of Series A-1, A-2, B-1, B-2, B-3 preferred shares (in shares)   9,500,000 9,500,000    
Conversion and re-designation of Pre-IPO Preferred Shares | ¥     ¥ (205,003)    
Conversion and re-designation of Pre-IPO Preferred Shares (in shares)   (56,105,000) (56,105,000)    
Balance at end of year | ¥       ¥ 48,016 ¥ 45,000
Balance at the end of the year (in shares)   0 0 19,361,727 19,361,727
Series B-4 Convertible Redeemable Preferred Stock          
Convertible Redeemable Preferred Shares          
Balance at beginning of year | ¥     ¥ 36,000 ¥ 36,000 ¥ 36,000
Balance at the beginning of the year (in shares) 20,982,000 9,338,761 9,338,761 9,338,761 9,338,761
Accretions of Preferred Shares to redemption value | $   $ 4,845      
Re-designation of ordinary shares into Series B-4 preferred shares | ¥     ¥ 35,822    
Re-designation of ordinary shares into Series B-4 preferred shares (in shares)   11,643,239 11,643,239    
Conversion and re-designation of Pre-IPO Preferred Shares | ¥     ¥ (76,667)    
Conversion and re-designation of Pre-IPO Preferred Shares (in shares)   (20,982,000) (20,982,000)    
Balance at end of year | ¥       ¥ 36,000 ¥ 36,000
Balance at the end of the year (in shares)   0 0 9,338,761 9,338,761
Series C-1 Convertible Redeemable Preferred Stock          
Convertible Redeemable Preferred Shares          
Balance at beginning of year | ¥     ¥ 277,259 ¥ 152,834  
Balance at the beginning of the year (in shares) 164,876,000 164,876,000 164,876,000 99,449,000  
Issuance of Preferred Shares | ¥       ¥ 100,000 ¥ 152,000
Issuance of Preferred Shares (in shares)       65,427,000 99,449,000
Accretions of Preferred Shares to redemption value   $ 23,534   ¥ 24,425 ¥ 834
Conversion and re-designation of Pre-IPO Preferred Shares | ¥     ¥ (300,793)    
Conversion and re-designation of Pre-IPO Preferred Shares (in shares)   (164,876,000) (164,876,000)    
Balance at end of year | ¥       ¥ 277,259 ¥ 152,834
Balance at the end of the year (in shares)   0 0 164,876,000 99,449,000
Series C-2 Convertible Redeemable Preferred Stock          
Convertible Redeemable Preferred Shares          
Re-designation of ordinary shares into Series C-2 preferred shares | ¥     ¥ 36,977    
Re-designation of ordinary shares into Series C-2 preferred shares (in shares)   12,545,000 12,545,000    
Conversion and re-designation of Pre-IPO Preferred Shares | ¥     ¥ (36,977)    
Conversion and re-designation of Pre-IPO Preferred Shares (in shares)   (12,545,000) (12,545,000)    
Series D Convertible Redeemable Preferred Stock          
Convertible Redeemable Preferred Shares          
Issuance of Preferred Shares | ¥     ¥ 169,750    
Issuance of Preferred Shares (in shares) 39,999,999 39,999,999 39,999,999    
Accretions of Preferred Shares to redemption value | $   $ 1,852      
Conversion and re-designation of Pre-IPO Preferred Shares | ¥     ¥ (171,602)    
Conversion and re-designation of Pre-IPO Preferred Shares (in shares)   (39,999,999) (39,999,999)