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Accounts Receivable (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Components of accounts receivable    
Accounts receivable $ 16,359,594 $ 15,719,847
Less: allowance for doubtful accounts (1,335,893) (1,797,476)
Accounts receivable, net $ 15,023,701 $ 13,922,371