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Accounts Receivable (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Subclassifications of assets, liabilities and equities [abstract]    
Receivables due from related parties $ 0 $ 0
Receivable due from management or employees 0 $ 0
Accounts receivable balance as a guarantee to support work commitments $ 5,100,000