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Short-Term Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments Schedule [Abstract] |
Short-Term Investments | Short-term investments consisted of the following as of December 31, 2016 and 2017:
|  | December 31, |
|  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | US$ |
Fixed rate time deposits |  |  | 277,946 |  |  |  | 548,890 |  |  |  | 84,363 |

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