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Accounts Receivable, Net
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Accounts Receivable, Net
3. ACCOUNTS RECEIVABLE, NET

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

 

     December 31,  
     2013      2014  
     RMB      RMB      US$  

Accounts receivable

      466,965         737,030         118,788   

Allowance for doubtful accounts

      (1,253 )       (335 )       (54 ) 
  

 

 

     

 

 

     

 

 

  

Total

   465,712      736,695      118,734   
  

 

 

     

 

 

     

 

 

  

As of December 31, 2013 and 2014, all accounts receivable were due from third party customers.

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

 

     December 31,  
     2013      2014  
     RMB      RMB      US$  

Beginning balance

      1,161         1,253         202   

Additions charged to bad debt expense

      251         348         56   

Reversal

      —           (306 )       (49 ) 

Write off

      (159 )       (960 )       (155 ) 
  

 

 

     

 

 

     

 

 

  

Ending balance

   1,253      335      54   
  

 

 

     

 

 

     

 

 

  

The Group recognized additions to allowance for doubtful accounts amounting to RMB790, RMB251 and RMB42 (US$7) within general and administrative expenses, for the years ended December 31, 2012, 2013 and 2014, respectively.