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Accounts Receivable (Tables)
 3 Months Ended
Mar. 31, 2013
Changes in Allowance for Doubtful Accounts

Changes in the Company’s allowance for doubtful accounts for the three months ended March 31, 2012 and 2013 are as follows:

 

 

For the three months ended
March 31,  

 

 

 

2012  

2013  

 

 

 

 

(Unaudited)

(Unaudited)

Beginning balance             

$              22,292             

$              39,018             

Bad debt expense             

              11,751             

              11,980             

Uncollectible accounts written off             

              (5,908              )

              0

 

 

 

Ending balance             

$              28,135             

$              50,998