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Summary of Significant Accounting Policies (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract]    
Accounts receivable $ 6,399,233 $ 11,690,495
Allowance for doubtful accounts (2,139,765) (9,508,708)
Accounts receivable, net $ 4,259,468 $ 2,181,787