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Prepaid Expenses and Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:

 

       December 31,  
       2015        2016  
       RMB        RMB        US$  

Prepayments

        272,859          317,262          45,695  

Rental deposits

        10,051          1,494          215  

Interest receivable

        9,944          11,690          1,684  

Staff advances

        6,529          7,712          1,111  

Receivables from third-party payment platform

        4,598          12,327          1,775  

Other receivables

        34,696          26,734          3,851  
    

 

 

       

 

 

       

 

 

  
       338,677          377,219          54,331