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Ordinary shares (Details) - $ / shares | 1 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2016 | May 31, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015
Ordinary shares |  |  |  |  |
Ordinary shares, par value (in dollars per share) |  |  |  | $ 0.00002 | $ 0.00002
RSUs and share options |  |  |  |  |
Ordinary shares |  |  |  |  |
Ordinary shares reserved for issuance |  |  |  | 130,816,834 | 93,722,508
Ordinary shares | Huang River Investment Limited | Transaction with Tencent |  |  |  |  |
Ordinary shares |  |  |  |  |
Ordinary shares issued |  |  | 351,678,637 |  |
Class A ordinary shares |  |  |  |  |
Ordinary shares |  |  |  |  |
Ordinary shares issued |  | 166,120,400 |  |  |
Class A ordinary shares | Huang River Investment Limited | Private Placement |  |  |  |  |
Ordinary shares |  |  |  |  |
Ordinary shares issued |  | 139,493,960 |  |  |
Class A ordinary shares | Newheight Holdings Ltd | Transaction with Walmart |  |  |  |  |
Ordinary shares |  |  |  |  |
Ordinary shares issued | 144,952,250 |  |  |  |

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