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Accounts Receivable, Net
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Accounts Receivable, Net
4. ACCOUNTS RECEIVABLE, NET

Accounts receivable and allowance for doubtful accounts consist of the following:

 

     December 31,  
     2015      2016  
     RMB      RMB      US$  

Accounts receivable

      1,077,771        1,206,436        173,763  

Allowance for doubtful accounts

      (2,315 )       (512 )       (74 ) 
  

 

 

     

 

 

     

 

 

  

Total

      1,075,456        1,205,924        173,689  
  

 

 

     

 

 

     

 

 

  

As of December 31, 2015 and 2016, all accounts receivable were due from third party customers.

An analysis of the allowance for doubtful accounts is as follows:

 

       December 31,  
       2015        2016  
       RMB        RMB        US$  

Beginning balance

        335          2,315          333  

Additions charged to bad debt expense

        2,621          2,792          402  

Reversal

        (442 )         (489 )         (70 ) 

Write off

        (199 )         (4,106 )         (591 ) 
    

 

 

       

 

 

       

 

 

  

Ending balance

        2,315          512          74  
    

 

 

       

 

 

       

 

 

  

The Group recognized additions to allowance for doubtful accounts amounting to RMB42, RMB2,179 and RMB2,303 (US$332) within general and administrative expenses, for the years ended December 31, 2014, 2015 and 2016, respectively.