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Accounts Receivable (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Components of accounts receivable    
Accounts receivable $ 15,719,847 $ 12,532,825
Less: allowance for doubtful accounts (1,797,476) (860,923)
Accounts receivable, net $ 13,922,371 $ 11,671,902