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Accounts Receivable (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Components of accounts receivable    
Accounts receivable $ 16,836,627 $ 15,719,847
Less: allowance for doubtful accounts (3,813,179) (1,797,476)
Accounts receivable, net $ 13,023,448 $ 13,922,371