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Business and Credit Concentrations (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Concentration Risk [Line Items]    
Concentration Risk, Additional Characteristic 0  
Sales Revenue, Net [Member]    
Concentration Risk [Line Items]    
Concentration Risk, Customer 0  
Accounts Receivable [Member]    
Concentration Risk [Line Items]    
Concentration Risk, Customer 0 0