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Concentrations (Details) - Customers
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accounts Receivable [Member]    
Concentrations (Textual)    
Number of customers 2 1
Percentage of concentrations of credit risk 100.00% 100.00%
Revenues [Member]    
Concentrations (Textual)    
Number of customers 4 1
Percentage of concentrations of credit risk 85.00% 87.00%