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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' (DEFICIT) EQUITY ¥ in Thousands, $ in Thousands | Ordinary Shares Ordinary shares Class A CNY (¥) shares | Ordinary Shares Ordinary shares Class B CNY (¥) shares | Treasury Shares CNY (¥) shares | Additional Paid-in Capital CNY (¥) | Subscription receivables CNY (¥) | Accumulated deficit CNY (¥) | Accumulated Other Comprehensive Income (Loss) CNY (¥) | Non-controlling Interest CNY (¥) | Ordinary shares Class A shares | Ordinary shares Class B shares | USD ($) | CNY (¥)
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2016 | ¥ 25 |  |  | ¥ 2,200 | ¥ (2,225) | ¥ (755,058) | ¥ 64,870 | ¥ 2,185 |  |  |  | ¥ (688,003)
Beginning balance (in shares) at Dec. 31, 2016 | shares | 72,000,000 |  |  |  |  |  |  |  |  |  |  |
Changes in shareholders' (deficit) equity |  |  |  |  |  |  |  |  |  |  |  |
Receipts of subscription receivables from shareholders |  |  |  |  | 25 |  |  |  |  |  |  | 25
Share-based compensation |  |  |  | 9,921 |  |  |  |  |  |  |  | 9,921
Net loss |  |  |  |  |  | (248,580) |  | (747) |  |  |  | (249,327)
Unrealized gains of available-for-sale securities, net of tax |  |  |  |  |  |  | 5,181 |  |  |  |  | 5,181
Reclassification of realized gains, net of tax |  |  |  |  |  |  | (1,154) |  |  |  |  | (1,154)
Foreign currency translation |  |  |  |  |  |  | (21,347) |  |  |  |  | (21,347)
Ending Balance at Dec. 31, 2017 | ¥ 25 |  |  | 12,121 | (2,200) | (1,003,638) | 47,550 | 1,438 |  |  |  | (944,704)
Ending Balance (in shares) at Dec. 31, 2017 | shares | 72,000,000 |  |  |  |  |  |  |  |  |  |  |
Changes in shareholders' (deficit) equity |  |  |  |  |  |  |  |  |  |  |  |
Share surrendered for cancellation (Note13) |  |  |  | (2,200) | ¥ 2,200 |  |  |  |  |  |  |
Share-based compensation |  |  |  | 51,359 |  |  |  |  |  |  |  | 51,359
Re-designation of Class A ordinary shares into Class B ordinary shares (Note 13) | ¥ (25) | ¥ 25 |  |  |  |  |  |  |  |  |  |
Re-designation of Class A ordinary shares into Class B ordinary shares (Note 13) (in shares) | shares | (72,000,000) | 72,000,000 |  |  |  |  |  |  |  |  |  |
Issuance of ordinary shares upon initial public offering ("IPO"), net of issuance costs of RMB19,134 | ¥ 5 |  |  | 694,873 |  |  |  |  |  |  |  | 694,878
Issuance of ordinary shares upon initial public offering ("IPO"), net of issuance costs of RMB19,134 (in shares) | shares | 15,969,110 |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred shares into Class A ordinary shares upon IPO | ¥ 24 |  |  | 1,784,725 |  |  |  |  |  |  |  | 1,784,749
Conversion of preferred shares into Class A ordinary shares upon IPO (in shares) | shares | 75,118,996 |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  | (380,091) |  | (1,950) |  |  |  | (382,041)
Unrealized gains of available-for-sale securities, net of tax |  |  |  |  |  |  | 8,734 |  |  |  |  | 8,734
Reclassification of realized gains, net of tax |  |  |  |  |  |  | (10,869) |  |  |  |  | (10,869)
Foreign currency translation |  |  |  |  |  |  | 21,658 |  |  |  |  | 21,658
Ending Balance at Dec. 31, 2018 | ¥ 29 | ¥ 25 |  | 2,540,878 |  | (1,383,729) | 67,073 | (512) |  |  |  | 1,223,764
Ending Balance (in shares) at Dec. 31, 2018 | shares | 91,088,106 | 72,000,000 |  |  |  |  |  |  | 91,088,106 | 72,000,000 |  |
Changes in shareholders' (deficit) equity |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  | 54,281 |  |  |  |  |  |  |  | 54,281
Issuance of ordinary shares upon the exercise of stock options and vesting of restricted share units | ¥ 1 |  |  | 11,327 |  |  |  |  |  |  |  | 11,328
Issuance of ordinary shares upon the exercise of stock options and vesting of restricted share units (in shares) | shares | 2,517,780 |  |  |  |  |  |  |  |  |  |  |
Repurchase of shares |  |  | ¥ (22,991) |  |  |  |  |  |  |  |  | (22,991)
Repurchase of shares (in shares) | shares | (1,485,862) |  | 1,485,862 |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  | (499,606) |  | (2,221) |  |  | $ (72,083) | (501,827)
Unrealized gains of available-for-sale securities, net of tax |  |  |  |  |  |  | 7,335 |  |  |  | 1,054 | 7,335
Reclassification of realized gains, net of tax |  |  |  |  |  |  | (9,635) |  |  |  | (1,384) | (9,635)
Foreign currency translation |  |  |  |  |  |  | 11,668 |  |  |  | 1,676 | 11,668
Ending Balance at Dec. 31, 2019 | ¥ 30 | ¥ 25 | ¥ (22,991) | ¥ 2,606,486 |  | ¥ (1,883,335) | ¥ 76,441 | ¥ (2,733) |  |  | $ 111,167 | ¥ 773,923
Ending Balance (in shares) at Dec. 31, 2019 | shares | 92,120,024 | 72,000,000 | 1,485,862 |  |  |  |  |  | 92,120,024 | 72,000,000 |  |

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