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Stockholders' Equity (Narrative) (Details)
 1 Months Ended 12 Months Ended
Oct. 04, 2018
USD ($)
$ / shares
shares
Jul. 21, 2017
USD ($)
$ / shares
shares
Jul. 31, 2017
$ / shares
shares
Dec. 31, 2019
USD ($)
item
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
Class of Stock [Line Items]            
Preferred stock, par value (in dollars per share)       $ 0.001 $ 0.001  
Common stock, par value (in dollars per share)       $ 0.001 $ 0.001  
Proceeds from issuance of common stock, net of issuance costs | $       $ 4,049,000 $ 630,000  
Proceeds from further issuance of share | $       $ 4,049,000 $ 630,000  
Percentage of blocker provision       4.99%    
Conversion percentage       9.99%    
Number of warrant outstanding | $       $ 7,490,500    
Warrant exercise price       $ 2.00    
Common Stock [Member]            
Class of Stock [Line Items]            
Proceeds from further issuance of share | $       $ 5,000    
Number of shares issued (in shares) | shares       4,702,527 500,000  
Underwriting Agreement [Member]            
Class of Stock [Line Items]            
Proceeds from issuance of common stock, net of issuance costs | $   $ 13,700,000        
Common Stock Sales Agreement [Member]            
Class of Stock [Line Items]            
Common stock, par value (in dollars per share) $ 0.001          
Proceeds from issuance of common stock, net of issuance costs | $ $ 4,700,000          
Number of shares issued (in shares) | shares 5,202,527          
Selling commissions, percentage 3.00%          
Class B Units [Member] | Underwriting Agreement [Member]            
Class of Stock [Line Items]            
Number of shares issued (in shares) | shares   8,872        
Share Price   $ 1,000        
Class B Units [Member] | Underwriting Agreement [Member] | Common Stock [Member]            
Class of Stock [Line Items]            
Number of common shares issued upon conversion | shares   500        
Price per share used to determine number of shares of common stock   $ 1,000.00        
Class A Units [Member] | Underwriting Agreement [Member]            
Class of Stock [Line Items]            
Number of shares issued (in shares) | shares   3,154,000        
Share issue price per share   $ 2        
Class A Units [Member] | Underwriting Agreement [Member] | Common Stock [Member]            
Class of Stock [Line Items]            
Number of warrants connected with Underwritten Public Offering | shares   1        
Number of securities called by each unit | shares   1        
Maximum [Member] | Common Stock Sales Agreement [Member]            
Class of Stock [Line Items]            
Proceeds from further issuance of share | $ $ 5,000,000          
Series A Convertible Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred stock, shares issued | shares     8,872 264 264  
Preferred stock, shares outstanding | shares       264 264  
Preferred stock, par value (in dollars per share)       $ 0.001 $ 0.001  
Number of common shares issued upon conversion | shares         4,304,000  
Number of shares converted | shares       132,000 8,608  
Price per share used to determine number of shares of common stock     $ 1,000      
Conversion price of convertible preferred stock     $ 2.00      
Percentage of blocker provision     4.99%      
Conversion percentage     9.99%      
Measurement period of consecutive trading days used in determining whether specified triggers are met which would allow the entity to require the conversion of all or part of outstanding preferred stock       30 days    
Series A Convertible Preferred Stock [Member] | Underwriting Agreement [Member]            
Class of Stock [Line Items]            
Preferred stock, par value (in dollars per share)   $ 0.001        
Series A Convertible Preferred Stock [Member] | Class B Units [Member] | Underwriting Agreement [Member]            
Class of Stock [Line Items]            
Number of securities called by each unit | shares   1        
Series A Convertible Preferred Stock [Member] | Minimum [Member]            
Class of Stock [Line Items]            
Percentage by which the weighted average price of common stock during the measurement period exceeds the initial conversion price which triggers the right of the entity to cause all or part of the outstanding preferred stock to be converted       300.00%    
Threshold amount of daily trading volume on each trading day during the measurement period which triggers the right of the entity to cause all or part of the outstanding preferred stock to be converted | $       $ 500,000    
6% Convertible Exchangeable Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred stock, shares issued | shares       335,273 335,273  
Preferred stock, shares outstanding | shares       335,273 335,273  
Number of common shares issued upon conversion | shares       0.00507    
Dividend rate on convertible exchangeable preferred stock (in percent)       6.00% 6.00%  
Share issue price per share       $ 10.00    
Liquidation preference (in dollars per share)       10.00    
Accrued and unpaid dividends in arrears on preferred stock | $         $ 700,000 $ 700,000
Accrued and unpaid dividends in arrears on preferred stock (in dollars per share)         $ 1.95 $ 1.95
Shares reserved for future issuance upon conversion | shares         1,698  
Conversion price (in dollars per share)       1,974    
Share Price       $ 2,961    
Percentage of closing sales price of common stock that conversion price must exceed in order for preferred stock to be convertible       150.00%    
Number of trading days within 30 trading days in which the closing price of common stock must exceed conversion price for preferred stock to be convertible       20 days    
Number of trading days during which closing price of common stock must exceed conversion price for at least 20 days in order for the preferred stock to be convertible       30 days    
Number of trading days prior to notice of automatic conversion       5 days    
Number of quarterly periods in which dividends are not paid that triggers the right of preferred stock holders to nominate and elect directors | item       6    
Redemption price per share (in dollars per share)       $ 10.00    
Interest rate of Convertible Subordinated Debentures (as a percent)       6.00%    
Debt principal amount per share, basis for exchange (in dollars per share)       $ 10.00    
Debt instrument, term       25 years    
Preferred stock dividend declared, amount per share       $ 0.15