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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) |  |

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