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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' (DEFICIT)/EQUITY ¥ in Thousands | Ordinary shares Class A ordinary shares USD ($) shares | Ordinary shares Class A ordinary shares CNY (¥) shares | Ordinary shares Class B ordinary shares USD ($) shares | Ordinary shares Class B ordinary shares CNY (¥) shares | Ordinary shares Series B-3 Convertible Redeemable Preferred Stock CNY (¥) shares | Ordinary shares Series B-4 Convertible Redeemable Preferred Stock CNY (¥) shares | Ordinary shares Series A-1, A-2, B-1, B-2 and B-3 convertible redeemable preferred shares CNY (¥) shares | Ordinary shares Series C-2 Convertible Redeemable Preferred Stock CNY (¥) shares | Ordinary shares CNY (¥) shares | Additional paid-in capital Series B-3 Convertible Redeemable Preferred Stock CNY (¥) | Additional paid-in capital Series A-1, A-2, B-1, B-2 and B-3 convertible redeemable preferred shares CNY (¥) | Additional paid-in capital CNY (¥) | Treasury stock USD ($) shares | Treasury stock CNY (¥) shares | Accumulated deficit Series B-3 Convertible Redeemable Preferred Stock CNY (¥) | Accumulated deficit Series B-4 Convertible Redeemable Preferred Stock CNY (¥) | Accumulated deficit Series A-1, A-2, B-1, B-2 and B-3 convertible redeemable preferred shares CNY (¥) | Accumulated deficit Series C-2 Convertible Redeemable Preferred Stock CNY (¥) | Accumulated deficit CNY (¥) | Accumulated other comprehensive income/loss CNY (¥) | Non controlling interests CNY (¥) | Series B-3 Convertible Redeemable Preferred Stock CNY (¥) | Series B-4 Convertible Redeemable Preferred Stock CNY (¥) | Series A-1, A-2, B-1, B-2 and B-3 convertible redeemable preferred shares CNY (¥) | Series C-2 Convertible Redeemable Preferred Stock CNY (¥) | USD ($) | CNY (¥)
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Balance, beginning of the year at Dec. 31, 2016 |  |  |  |  |  |  |  |  | ¥ 184 |  |  |  |  |  |  |  |  |  | ¥ (433,247) |  |  |  |  |  |  |  | ¥ (433,063)
Balance, beginning of the year (in shares) at Dec. 31, 2016 | shares |  |  |  |  |  |  |  |  | 266,276,697 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,923 |  |  |  |  |  |  |  | 7,923
Capital injection from shareholders |  |  |  |  |  |  |  |  |  |  |  | ¥ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000
Share-based compensation |  |  |  |  |  |  |  |  |  |  |  | 4,888 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,888
Share-based compensation (in shares) | shares |  |  |  |  |  |  |  |  | 22,724,708 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretions of convertible redeemable preferred shares to redemption value |  |  |  |  |  |  |  |  |  |  |  | (2,834) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,834)
Shareholder's contribution |  |  |  |  |  |  |  |  |  |  |  | 1,401 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,401
Balance, end of the year at Dec. 31, 2017 |  |  |  |  |  |  |  |  | ¥ 184 |  |  | 13,455 |  |  |  |  |  |  | (425,324) |  |  |  |  |  |  |  | (411,685)
Balance, end of the year (in shares) at Dec. 31, 2017 | shares |  |  |  |  |  |  |  |  | 289,001,405 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,518 |  |  |  |  |  |  |  | 40,518
Share-based compensation |  |  |  |  |  |  |  |  |  |  |  | 5,111 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,111
Share-based compensation (in shares) | shares |  |  |  |  |  |  |  |  | 19,684,607 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion on redeemable non controlling interests to redemption value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,025) |  |  |  |  |  |  |  | (1,025)
Accretions of convertible redeemable preferred shares to redemption value |  |  |  |  |  |  |  |  |  |  |  | (19,864) |  |  |  |  |  |  | (100,196) |  |  |  |  |  |  |  | (120,060)
Shareholder's contribution |  |  |  |  |  |  |  |  |  |  |  | 1,298 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,298
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 231 |  |  |  |  |  |  | 231
Balance, end of the year at Dec. 31, 2018 |  |  |  |  |  |  |  |  | ¥ 184 |  |  |  |  |  |  |  |  |  | (486,027) | 231 |  |  |  |  |  |  | (485,612)
Balance, end of the year (in shares) at Dec. 31, 2018 | shares |  |  |  |  |  |  |  |  | 308,686,012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (25,755) |  | ¥ (156) |  |  |  |  | $ (3,721,000) | (25,911)
Share-based compensation |  |  |  |  |  |  |  |  |  |  |  | 64,387 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,387
Share-based compensation (in shares) | shares |  |  |  |  |  |  |  |  | 1,609,789 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,561,468 | ¥ (2,333) |  |  |  |  |  |  |  |  |  |  |  |  | (2,333)
Share repurchase (in shares) | shares |  |  |  |  |  |  |  |  | (2,561,468) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Re-designation of ordinary shares into Class A and Class B ordinary shares upon initial public offering |  | ¥ 81 |  | ¥ 66 |  |  |  |  | ¥ (147) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Re-designation of ordinary shares into Class A and Class B ordinary shares upon initial public offering (in shares) | shares | 141,766,682 | 141,766,682 | 96,082,700 | 96,082,700 |  |  |  |  | (237,849,382) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Re-designation of Preferred Shares into Class A ordinary shares upon initial public offering |  | ¥ 508 |  |  |  |  |  |  |  |  |  | 1,877,739 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,878,247
Re-designation of Preferred Shares into Class A ordinary shares upon initial public offering (in shares) | shares | 726,015,520 | 726,015,520 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Re-designation of Series A-1 into Series B-3 convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  | (1,409) |  |  |  |  |  |  | (25,378) |  |  |  |  |  |  |  | (26,787)
Re-designation of ordinary shares |  |  |  |  | ¥ (10) | ¥ (7) | ¥ (11) | ¥ (9) |  | ¥ (1,157) | ¥ (25,749) |  |  |  | ¥ (28,799) | ¥ (20,261) | ¥ (284,224) | ¥ (36,968) |  |  |  | ¥ (29,966) | ¥ (20,268) | ¥ (309,984) | ¥ (36,977) |  |
Re-designation of ordinary shares (in shares) | shares |  |  |  |  | (17,215,818) | (11,643,239) | (28,480,894) | (12,545,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuance upon initial public offering, net of issuance costs of |  | ¥ 24 |  |  |  |  |  |  |  |  |  | 86,214 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 86,238
Share issuance upon initial public offering, net of issuance costs of US$ (in shares) | shares | 34,500,000 | 34,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion on redeemable non controlling interests to redemption value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,808) |  |  |  |  |  |  |  | (1,808)
Accretions of convertible redeemable preferred shares to redemption value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (449,130) |  |  |  |  |  |  |  | (449,130)
Shareholder's contribution |  |  |  |  |  |  |  |  |  |  |  | 242 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 242
Capital injection from non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,895 |  |  |  |  |  | 6,895
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,285) |  |  |  |  |  |  | (3,285)
Balance, end of the year at Dec. 31, 2019 | $ 902,282,202 | ¥ 613 | $ 96,082,700 | ¥ 66 |  |  |  |  |  |  |  | ¥ 2,000,267 |  | ¥ (2,333) |  |  |  |  | ¥ (1,358,350) | ¥ (3,054) | ¥ 6,739 |  |  |  |  | $ 92,498,000 | ¥ 643,948
Balance, end of the year (in shares) at Dec. 31, 2019 | shares |  |  |  |  |  |  |  |  |  |  |  |  | 2,561,468 | 2,561,468 |  |  |  |  |  |  |  |  |  |  |  |  |

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