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Short-Term Investments (Tables)
12 Months Ended
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