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Convertible Debt at Fair Value (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 01, 2017
Mar. 16, 2016
Mar. 31, 2018
Mar. 31, 2017
Debt Instrument [Line Items]        
Gain (loss) on derivatives and convertible debt     $ 447,000 $ 175,000
6.25% Convertible Debt [Member]        
Debt Instrument [Line Items]        
Interest rate   6.25% 6.25%  
Principal amount   $ 1,012,000    
Number of shares of common stock debt can convert into 97,269 97,269    
Maximum ownership percentage of voting stock upon debt conversion   49.00%    
Gain (loss) on derivatives and convertible debt     $ 20,000 $ 240,000