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Summary of Significant Accounting Policies (Concentration of Sales to Major Customers Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accounts Receivable Concentration    
Accounts receivable $ 182,000 $ 1,500,000
Concentration Risk, Percentage 74.00% 91.00%
Secondary Customer Revenue Concentration    
Accounts receivable $ 54,000  
Concentration Risk, Percentage 22.00%  
Customer Revenue Concentration    
Revenue $ 13,500,000 $ 9,000,000
Concentration Risk, Percentage 91.00% 98.00%