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Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2014
Accounts Receivable / Restricted Net Assets [Abstract]  
Components of accounts receivable
  
June 30, 2014
  
December 31, 2013
 
Accounts receivable
 $14,487,175  $16,065,074 
Less: allowance for doubtful accounts
  (824,168)  (830,211)
  $13,663,007  $15,234,863