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Accounts Receivable, Net
 12 Months Ended
Dec. 31, 2017
Accounts Receivable, Net
5. ACCOUNTS RECEIVABLE, NET

 

     As of December 31,  
     2016      2017  
     RMB      RMB      US$  

Accounts receivable

      672,872        693,387        106,572  

Allowance for doubtful accounts

      (71,987 )       (72,115 )       (11,084 ) 
  

 

 

     

 

 

     

 

 

  
     600,885        621,272        95,488  
  

 

 

     

 

 

     

 

 

  

As of December 31, 2016 and 2017, all accounts receivable were due from third party customers. Provision for doubtful accounts for the years ended December 31, 2015, 2016 and 2017 were RMB13,641, RMB42,533 and RMB11,688 (US$1,796), respectively.