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Stockholders' Equity (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 11, 2020
Oct. 04, 2018
Jul. 31, 2017
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2017
Class of Stock [Line Items]                
Common stock, par value (in dollars per share)       $ 0.001     $ 0.001  
Proceeds from issuance of common stock, net of issuance costs           $ 4,106,000    
Proceeds from further issuance of share           4,111,000    
Common Stock [Member]                
Class of Stock [Line Items]                
Proceeds from further issuance of share           $ 0    
Number of shares issued (in shares)           235,126    
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, gross         $ 4,300,000      
Proceeds from issuance of common stock, net of issuance costs         $ 4,700,000      
Selling commissions, percentage   3.00%            
Number of share sold under the sales agreement         235,126      
Maximum [Member] | Common Stock Sales Agreement [Member]                
Class of Stock [Line Items]                
Aggregate offering price   $ 5,000,000            
Warrant [Member]                
Class of Stock [Line Items]                
Conversion percentage       9.99%        
Number of warrants outstanding       $ 374,525        
Warrants, exercise price per share       $ 40.00        
Warrants, expiration date       Dec. 31, 2024        
Percentage of blocker provision       4.99%        
Proceeds from warrants exercised       $ 0   $ 0    
Series A Convertible Preferred Stock [Member]                
Class of Stock [Line Items]                
Preferred stock, shares issued     8,872 264     264  
Preferred stock, shares outstanding       264     264  
Preferred stock, par value (in dollars per share)       $ 0.001     $ 0.001  
Number of common shares issued upon conversion               215,200
Number of shares converted       6,600       8,608
Price per share used to determine number of shares of common stock     $ 1,000          
Conversion price of convertible preferred stock     $ 40.00          
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        
Percentage of blocker provision     4.99%          
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       335,273     335,273  
Preferred stock, shares outstanding       335,273     335,273  
Preferred stock, par value (in dollars per share)       $ 0.001     $ 0.001  
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        
Share Price       $ 59,220        
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 prior to notice of automatic conversion       5 days        
Interest rate of Convertible Subordinated Debentures (as a percent)       6.00%        
Redemption price per share (in dollars per share)       $ 10.00        
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              
6% Convertible Exchangeable Preferred Stock [Member] | Minimum [Member]                
Class of Stock [Line Items]                
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