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Consolidated Statements of Changes in Shareholders' Equity ¥ in Thousands, $ in Thousands | Ordinary shares Series A and A-1 convertible preferred shares CNY (¥) shares | Ordinary shares Series B convertible preferred shares CNY (¥) shares | Ordinary shares Series C Preferred Shares CNY (¥) shares | Ordinary shares CNY (¥) shares | Treasury stock CNY (¥) shares | Preferred Shares Series A and A-1 convertible preferred shares CNY (¥) shares | Preferred Shares Series B convertible preferred shares CNY (¥) shares | Additional paid-in capital Series A and A-1 convertible preferred shares CNY (¥) | Additional paid-in capital Series B convertible preferred shares CNY (¥) | Additional paid-in capital Series C Preferred Shares CNY (¥) | Additional paid-in capital CNY (¥) | Statutory reserves CNY (¥) | Accumulated other comprehensive income/(loss) CNY (¥) | Accumulated deficit CNY (¥) | Non-controlling interests CNY (¥) | Series C Preferred Shares CNY (¥) | USD ($) | CNY (¥)
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2013 |  |  |  | ¥ 199 |  | ¥ 255,850 | ¥ 88,241 |  |  |  | ¥ 6,251,869 | ¥ 2,648 | ¥ (268,618) | ¥ (4,263,624) |  |  |  | ¥ 2,066,565
Balance (in shares) at Dec. 31, 2013 | shares |  |  |  | 1,502,933,134 | (39,279,042) | 191,894,000 | 59,539,244 |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of ordinary shares |  |  |  | ¥ 80 |  |  |  |  |  |  | 29,091,883 |  |  |  |  |  |  | 29,091,963
Issuance of ordinary shares (in shares) | shares |  |  |  | 657,292,997 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A ordinary shares reserved for future exercise of share-based awards |  |  |  | ¥ 4 | ¥ (4) |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A ordinary shares reserved for future exercise of share-based awards ( in shares) | shares |  |  |  | 30,000,000 | (30,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares redemption value accretion |  |  |  |  |  |  |  |  |  |  | (7,957,640) |  |  |  |  |  |  | (7,957,640)
Conversion of preferred shares to ordinary shares | ¥ 24 | ¥ 7 | ¥ 32 |  |  | ¥ (255,850) | ¥ (88,241) | ¥ 255,826 | ¥ 88,234 | ¥ 15,130,871 |  |  |  |  |  | ¥ 15,130,903 |  |
Conversion of preferred shares to ordinary shares (in shares) | shares | 191,894,000 | 59,539,244 | 258,316,305 |  |  | (191,894,000) | (59,539,244) |  |  |  |  |  |  |  |  |  |  |
Exercise of share-based awards |  |  |  |  |  |  |  |  |  |  | 20,593 |  |  |  |  |  |  | 20,593
Exercise of share-based awards (in shares) | shares |  |  |  |  | 849,844 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation and vesting of share-based awards |  |  |  | ¥ 12 |  |  |  |  |  |  | 4,249,536 |  |  |  |  |  |  | 4,249,548
Share-based compensation and vesting of share-based awards (in shares) | shares |  |  |  | 93,780,970 | 6,390,905 |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,996,358) |  |  |  | (4,996,358)
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  | (121,612) |  |  |  |  | (121,612)
Net change in unrealized gains/(losses) on available for sale securities |  |  |  |  |  |  |  |  |  |  |  |  | 14,105 |  |  |  |  | 14,105
Statutory reserves |  |  |  |  |  |  |  |  |  |  |  | 12,361 |  | (12,361) |  |  |  |
Balance at Dec. 31, 2014 |  |  |  | ¥ 358 | ¥ (4) |  |  |  |  |  | 47,131,172 | 15,009 | (376,125) | (9,272,343) |  |  |  | 37,498,067
Balance (in shares) at Dec. 31, 2014 | shares |  |  |  | 2,793,756,650 | (62,038,293) |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of share-based awards |  |  |  |  | ¥ 1 |  |  |  |  |  | 68,009 |  |  |  |  |  |  | 68,010
Exercise of share-based awards (in shares) | shares |  |  |  |  | 2,694,404 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation and vesting of share-based awards |  |  |  |  |  |  |  |  |  |  | 1,193,945 |  |  |  |  |  |  | 1,193,945
Share-based compensation and vesting of share-based awards (in shares) | shares |  |  |  |  | 7,577,725 |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,107,940) | ¥ (9,566) |  |  | (9,117,506)
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  | 953,573 |  | 1,214 |  |  | 954,787
Net change in unrealized gains/(losses) on available for sale securities |  |  |  |  |  |  |  |  |  |  |  |  | (22,622) |  |  |  |  | (22,622)
Statutory reserves |  |  |  |  |  |  |  |  |  |  |  | 40,551 |  | (40,551) |  |  |  |
Capital injection from non-controlling interests shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 146,185 |  |  | 146,185
Balance at Dec. 31, 2015 |  |  |  | ¥ 358 | ¥ (3) |  |  |  |  |  | 48,393,126 | 55,560 | 554,826 | (18,420,834) | 137,833 |  |  | 30,720,866
Balance (in shares) at Dec. 31, 2015 | shares |  |  |  | 2,793,756,650 | (51,766,164) | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of ordinary shares |  |  |  | ¥ 19 |  |  |  |  |  |  | 9,592,239 |  |  |  |  |  |  | 9,592,258
Issuance of ordinary shares (in shares) | shares |  |  |  | 144,952,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares redemption value accretion |  |  |  |  |  |  |  |  |  |  | (444,657) |  |  |  |  |  |  | (444,657)
Exercise of share-based awards |  |  |  |  | ¥ 77,496 |  |  |  |  |  | (3,293) |  |  |  |  |  |  | 74,203
Exercise of share-based awards (in shares) | shares |  |  |  |  | 2,820,648 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation and vesting of share-based awards |  |  |  |  | ¥ 78,903 |  |  |  |  |  | 2,264,882 |  |  |  |  |  |  | 2,343,785
Share-based compensation and vesting of share-based awards (in shares) | shares |  |  |  |  | 8,812,582 |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of ordinary shares |  |  |  |  | ¥ (5,338,276) |  |  |  |  |  | (543,880) |  |  |  |  |  |  | (5,882,156)
Repurchase of ordinary shares (in shares) | shares |  |  |  |  | (62,131,568) |  |  |  |  |  |  |  |  |  |  |  |  |
Surrender of ordinary shares by certain shareholder | shares |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,362,133) | (51,591) |  | $ (491,678) | (3,413,724)
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  | 943,616 |  |  |  |  | 943,616
Net change in unrealized gains/(losses) on available for sale securities |  |  |  |  |  |  |  |  |  |  |  |  | 44,951 |  |  |  | 6,474 | 44,951
Statutory reserves |  |  |  |  |  |  |  |  |  |  |  | 77,378 |  | (77,378) |  |  |  |
Capital injection from non-controlling interests shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 183,720 |  |  | 183,720
Balance at Dec. 31, 2016 |  |  |  | ¥ 377 | ¥ (5,181,880) |  |  |  |  |  | ¥ 59,258,417 | ¥ 132,938 | ¥ 1,543,393 | ¥ (21,860,345) | ¥ 269,962 |  | $ 4,920,475 | ¥ 34,162,862
Balance (in shares) at Dec. 31, 2016 | shares |  |  |  | 2,938,708,899 | (102,264,502) |  |  |  |  |  |  |  |  |  |  |  |  |

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