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Stockholders' Equity - Preferred Stock (Details) - USD ($)
 9 Months Ended 12 Months Ended
Jul. 25, 2018
Jul. 17, 2018
Nov. 28, 2017
Sep. 30, 2018
Dec. 31, 2017
May 24, 2018
May 23, 2018
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)       23,500 23,500    
Preferred stock, shares outstanding (in shares)       4,624 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        
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      
Warrants liability fair value       $ 1,500,000 $ 3,100,000    
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 issued (in shares)       10,000 10,000    
Preferred stock, shares outstanding (in shares)       1,114 2,431    
Number of shares callable by warrants (in shares)     18,000,000        
Common stock issued (in shares)     3,000,000        
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)       3,510      
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