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Prepaid Expenses and Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:

 

     December 31,  
     2016      2017  
     RMB      RMB      US$  

Prepaid expenses

      163,443        344,696        52,979  

Staff field advances

      22,429        6,735        1,035  

Interest receivables

      13,576        17,644        2,712  

Receivables for the disposal of certain construction-in-progress

      20,290        —          —    

Tax recoverables

      309,426        376,642        57,889  

Deposits

      19,596        30,669        4,714  

Loan to third parties

      62,433        60,805        9,345  

Other receivables

      165,938        96,559        14,840  
  

 

 

     

 

 

     

 

 

  
     777,131        933,750        143,514