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Convertible Debt at Fair Value (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 16, 2016
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt Instrument [Line Items]          
Gain (loss) on derivatives and convertible debt   $ (456,000) $ 156,000 $ (693,000) $ 603,000
6.25% Convertible Debt [Member]          
Debt Instrument [Line Items]          
Interest rate 6.25% 6.25%   6.25%  
Principal amount $ 1,012,000        
Number of shares of common stock debt can convert into 97,269        
Maximum ownership percentage of voting stock upon debt conversion 49.00%        
Gain (loss) on derivatives and convertible debt   $ (24,000) $ (1,000) $ (72,000) $ 19,000