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v3.7.0.1

Principal Accounting Policies (Additional information) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 30, 2016 ¥ / $
Convenience translation [Abstract] |  |  |  |  |  |
Convenience translation, noon buying rate of US$ using RMB | ¥ / $ |  |  |  |  |  | 6.9430
Sales and marketing expenses [Abstract] |  |  |  |  |  |
Total advertising expenses | ¥ 160,100 | $ 23,100 | ¥ 117,900 | ¥ 64,400 |  |
Employee social security and welfare benefits [Abstract] |  |  |  |  |  |
Employee social security and welfare benefits | 72,600 | 10,500 | 75,600 | 73,700 |  |
Recently issued accounting pronouncements [Abstract] |  |  |  |  |  |
Deferred tax assets classified as current | 54,307 |  | 35,963 |  | $ 7,822 |
Deferred tax liabilities classified as current | ¥ | 0 |  |  |  |  |
Amount of changes in restricted cash included in investing activities | ¥ 229,602 | $ 33,070 | ¥ 125,000 | ¥ 0 |  |

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