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Accounts Receivable, Net (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Summary of accounts receivable    
Account receivables $ 3,106,720 $ 2,323,370
Less: Allowance for doubtful accounts (345,836) (336,707)
Accounts receivable, net $ 2,760,884 $ 1,986,663