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Stockholders' Equity - Preferred Stock (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jul. 25, 2018
Jul. 17, 2018
Nov. 28, 2017
Jun. 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)       1,186 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]              
Period exercisable from the date of issuance       30 months      
2018 Rights Offering [Member] | Subsequent Event [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            
Gross proceeds from private placement of stock $ 5,700,000            
2018 Rights Offering [Member] | Warrant [Member] | Subsequent Event [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] | Subsequent Event [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)       1,186 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]              
Number of shares callable by warrants (in shares) 7,059,150            
Common stock issued (in shares) 8,400,000            
Preferred stock, dividend payment terms       Holders of Series C Preferred Stock shall be entitled to receive dividends (on an as-if-converted-to-common-stock basis) in the same form as dividends actually paid on shares of the Company’s common stock when, as and if such dividends are paid on shares of common stock. Except as otherwise provided in the Certificate of Designation or as otherwise required by law, the Series C Preferred Stock has no voting rights. Upon the Company’s liquidation, dissolution or winding-up, whether voluntary or involuntary, holders of Series C Preferred Stock will be entitled to receive out of the Company’s assets, whether capital or surplus, an amount equal to the $1,000 stated value per share for each share of Series C Preferred Stock before any distribution or payment shall be made to the holders of any junior securities. The Company is not obligated to redeem or repurchase any shares of Series C Preferred Stock. Shares of Series C Preferred Stock are not otherwise entitled to any redemption rights, or mandatory sinking fund or analogous fund provisions.      
Preferred stock, voting rights       Series C Preferred Stock has no voting rights.      
Preferred stock, dividend preference       Upon the Company’s liquidation, dissolution or winding-up, whether voluntary or involuntary, holders of Series C Preferred Stock will be entitled to receive out of the Company’s assets, whether capital or surplus, an amount equal to the $1,000 stated value per share for each share of Series C Preferred Stock before any distribution or payment shall be made to the holders of any junior securities.      
Preferred stock, liquidation preference per share       $ 1,000      
Series C Convertible Preferred Stock [Member] | Subsequent Event [Member]              
Preferred Stock [Abstract]              
Preferred stock, shares authorized (in shares) 7,000            
Preferred stock, par value (in dollars per share) $ 0.001            
Common stock issued (in shares) 1,253            
Series C Convertible Preferred Stock [Member] | 2018 Rights Offering [Member] | Subsequent Event [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] | Subsequent Event [Member]              
Preferred Stock [Abstract]              
Charge on Non Transferable Subscription Rights   $ 0