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Concentration of Sales to Major Customers (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Customer Revenue Concentration        
Concentration Risk, Percentage 96.00% 92.00% 98.00% 91.00%
Accounts Receivable Concentration        
Concentration Risk, Percentage     99.00% 100.00%