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Convertible Subordinated Notes Payable (Narrative) (Details) - USD ($)
12 Months Ended
Apr. 18, 2018
Mar. 23, 2018
Dec. 31, 2019
Dec. 31, 2018
Converted accrued interest amount credited to common stock and additional paid-in capital     $ 1,558,000  
Unamortized discounts recognized as interest expense     $ 442,000 $ 271,000
Common Stock [Member]        
Number of converted shares of Convertible Notes     4,868,079  
Converted accrued interest amount credited to common stock and additional paid-in capital     $ 1,558,000  
Convertible Notes [Member]        
Aggregate principal amount $ 2,920,000 $ 2,920,000 1,400,000  
Converted accrued interest amount credited to common stock and additional paid-in capital     1,558,000  
Unamortized discounts recognized as interest expense     262,000  
Term 4 years 4 years    
Interest rate 6.00% 6.00%    
Conversion price $ 0.32 $ 0.32    
Discount with related closing costs   $ 137,000    
Notes payable, net of unamortized discounts     141,000 392,000
Notes payable from related parties     $ 120,000 $ 120,000
Beneficial conversion feature, intrinsic value   $ 350,000    
Convertible Notes [Member] | Common Stock [Member]        
Price per share $ 0.30 $ 0.36