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Accounts Receivable (Tables)
9 Months Ended
Sep. 30, 2012
Receivable [Abstract]  
Components of accounts receivable
 
   
September 30, 2012
   
December 31, 2011
 
Accounts receivable
  $ 13,118,222     $ 9,706,566  
Less: allowance for doubtful accounts
    (2,584,732 )     (2,618,608 )
    $ 10,533,490     $ 7,087,958