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Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2013
Accounts Receivable / Restricted Net Assets [Abstract]  
Components of accounts receivable
 
  
December 31, 2013
  
December 31, 2012
 
Accounts receivable
 $16,065,074  $12,670,680 
Less: allowance for doubtful accounts
  (830,211)  (2,592,057)
  $15,234,863  $10,078,623