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Accounts Receivable (Tables)
3 Months Ended
Mar. 31, 2014
Accounts Receivable / Restricted Net Assets [Abstract]  
Components of accounts receivable

  
March 31,
2014
  
December 31,
2013
 
Accounts receivable
 $14,502,949  $16,065,074 
Less: allowance for doubtful accounts
  (823,272)  (830,211)
  $13,679,677  $15,234,863