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Stockholders' Equity - Preferred Stock (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jul. 25, 2018
Jul. 17, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
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)     30,233   30,233    
Preferred stock, shares outstanding (in shares)     4,540   4,606    
Number of shares callable by warrants (in shares)           2,300,000 23,400,000
Common stock issued (in shares) 6,723            
Common Stock [Member]              
Preferred Stock [Abstract]              
Number of shares callable by warrants (in shares) 1            
Warrant exercise price (in dollars per share) $ 0.7986            
Common stock issued (in shares) 6,723   6,992,736 10,069      
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)     1,112   1,112    
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 issued (in shares)     6,723   6,723    
Preferred stock, shares outstanding (in shares)     3,428   3,494    
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