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Stockholders' Equity - Preferred Stock (Details) - USD ($)
 12 Months Ended
Jul. 25, 2018
Jul. 17, 2018
Nov. 28, 2017
Nov. 02, 2017
Dec. 31, 2018
Dec. 31, 2017
May 24, 2018
May 23, 2018
Nov. 27, 2017
Preferred Stock [Abstract]                  
Preferred stock, shares authorized (in shares)         5,000,000 5,000,000 5,000,000 5,000,000  
Preferred stock, par value (in dollars per share)         $ 0.001 $ 0.001      
Preferred stock, shares issued (in shares)         30,223 30,223      
Preferred stock, shares outstanding (in shares)         4,606 2,431      
Number of shares callable by warrants (in shares)             2,300,000 23,400,000  
Common stock issued (in shares) 6,723   10,000            
Common Stock [Member]                  
Preferred Stock [Abstract]                  
Number of shares callable by warrants (in shares) 1   1,800,000            
Warrant exercise price (in dollars per share) $ 0.7986   $ 3.333            
Common stock issued (in shares) 6,723   10,000   4,608,453 1,223,708      
2017 Rights Offering [Member]                  
Preferred Stock [Abstract]                  
Charge on Non Transferable Subscription Rights       $ 0          
Number of shares callable by warrants (in shares)       10,000          
Warrant exercise price (in dollars per share)       $ 3.333          
Period exercisable from the date of issuance         30 months        
Common stock issued (in shares)     10,000            
Gross proceeds from private placement of stock     $ 8,800,000            
Redemption price of warrant prior to expiration         $ 0.01        
Common stock price per share for warrant redemption         $ 8.33        
Number of consecutive trading days for warrant redemption         10 days        
2017 Rights Offering [Member] | Warrant [Member]                  
Preferred Stock [Abstract]                  
Number of shares callable by warrants (in shares)       18,000,000          
Number of warrants exercisable       10          
2017 Rights Offering [Member] | Common Stock [Member]                  
Preferred Stock [Abstract]                  
Number of shares callable by warrants (in shares)       1          
2018 Rights Offering [Member]                  
Preferred Stock [Abstract]                  
Number of shares callable by warrants (in shares)   1              
Warrant exercise price (in dollars per share)   $ 0.7986              
Period exercisable from the date of issuance         30 months        
Common stock issued (in shares) 6,723                
Gross proceeds from private placement of stock $ 5,700,000                
Redemption price of warrant prior to expiration         $ 0.01        
Common stock price per share for warrant redemption         $ 3.63        
Number of consecutive trading days for warrant redemption         20 days        
2018 Rights Offering [Member] | Warrant [Member]                  
Preferred Stock [Abstract]                  
Number of shares callable by warrants (in shares)   1,050              
Warrant exercise price (in dollars per share)   $ 1,000              
2018 Rights Offering [Member] | Common Stock [Member]                  
Preferred Stock [Abstract]                  
Number of shares callable by warrants (in shares)   1              
Series A Convertible Preferred Stock [Member]                  
Preferred Stock [Abstract]                  
Preferred stock, shares issued (in shares)         13,500 13,500      
Convertible preferred stock         3.60% 3.60%      
Preferred stock, shares outstanding (in shares)         0 0      
Series B Convertible Preferred Stock [Member]                  
Preferred Stock [Abstract]                  
Preferred stock, shares authorized (in shares)                 10,000
Preferred stock, par value (in dollars per share)                 $ 0.001
Preferred stock, shares issued (in shares)         10,000 10,000      
Preferred stock, shares outstanding (in shares)         1,112 2,431      
Number of shares callable by warrants (in shares)     18,000,000            
Common stock issued (in shares)     3,000,000            
Series B Convertible Preferred Stock [Member] | 2017 Rights Offering [Member]                  
Preferred Stock [Abstract]                  
Number of shares callable by warrants (in shares)       10,000          
Series C Convertible Preferred Stock [Member]                  
Preferred Stock [Abstract]                  
Preferred stock, shares authorized (in shares) 7,000                
Preferred stock, par value (in dollars per share) $ 0.001                
Preferred stock, shares outstanding (in shares)         3,494 0      
Number of shares callable by warrants (in shares) 7,059,150                
Number of share converted into common stock for each share (in shares) 1,253                
Series C Convertible Preferred Stock [Member] | Dividend Paid [Member]                  
Preferred Stock [Abstract]                  
Dividends payable         $ 2,500,000        
Series C Convertible Preferred Stock [Member] | 2018 Rights Offering [Member]                  
Preferred Stock [Abstract]                  
Number of shares callable by warrants (in shares)   20,000              
Common Stock and Series B Convertible Preferred Stock [Member] | 2018 Rights Offering [Member]                  
Preferred Stock [Abstract]                  
Charge on Non Transferable Subscription Rights   $ 0