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Stockholders' Equity - Preferred Stock (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 25, 2019
Aug. 02, 2019
Jul. 25, 2018
Jul. 17, 2018
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Aug. 06, 2019
Aug. 05, 2019
Sep. 30, 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 5,000,000      
Preferred stock, par value (in dollars per share)         $ 0.001 $ 0.001 $ 0.001          
Preferred stock, shares outstanding (in shares)         1,959 1,959 4,606          
Preferred stock, shares issued (in shares)         1,959 1,959 4,606          
Number of shares callable by warrants (in shares)         50 50         2,300,000 23,400,000
Preferred stock, shares outstanding         1,959 1,959 4,606          
Common stock issued (in shares)     6,723                  
2018 Rights Offering [Member]                        
Preferred Stock [Abstract]                        
Number of shares callable by warrants (in shares)       1                
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 $ 0.01            
Common stock price per share for warrant redemption           $ 181.50            
Number of consecutive trading days for warrant redemption           20 days            
Warrants liability fair value         $ 200,000 $ 200,000 $ 3,100,000          
Warrants exercisable price         $ 3,200,000              
2018 Rights Offering [Member] | Warrant [Member]                        
Preferred Stock [Abstract]                        
Number of shares callable by warrants (in shares)       1,050                
Warrant exercise price $ 3.2132     $ 1,000                
Series A Convertible Preferred Stock [Member]                        
Preferred Stock [Abstract]                        
Preferred stock, shares outstanding (in shares)         0 0 0          
Convertible preferred stock           3.60% 3.60%          
Preferred stock, shares outstanding         0 0 0          
Series B Convertible Preferred Stock [Member]                        
Preferred Stock [Abstract]                        
Preferred stock, shares outstanding (in shares)         1,021 1,021 1,112          
Preferred stock, shares issued (in shares)         1,021 1,021 1,112          
Preferred stock, shares outstanding         1,021 1,021 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 outstanding (in shares)         938 938 3,494          
Preferred stock, shares issued (in shares)         938 938 3,494          
Number of shares callable by warrants (in shares)     7,059,150                  
Preferred stock conversion price (in dollars per share)         $ 39.93 $ 39.93            
Preferred stock conversion price reduced (in dollars per share)         $ 7.50 $ 7.50            
Preferred stock, shares outstanding         938 938 3,494          
Series C Convertible Preferred Stock [Member] | Dividend Paid [Member]                        
Preferred Stock [Abstract]                        
Dividends payable         $ 554,000 $ 554,000 $ 2,500,000     $ 2,500,000    
Series C Convertible Preferred Stock [Member] | 2018 Rights Offering [Member]                        
Preferred Stock [Abstract]                        
Preferred stock, shares outstanding (in shares)         938 938            
Number of shares callable by warrants (in shares)       20,000                
Preferred stock conversion price (in dollars per share) 7.50 $ 39.93                    
Preferred stock conversion price reduced (in dollars per share) $ 3.2132 7.50                    
Preferred stock, shares outstanding         938 938            
Number of preferred stock, shares exercised           291,920            
Common Stock and Series B Convertible Preferred Stock [Member] | 2018 Rights Offering [Member]                        
Preferred Stock [Abstract]                        
Charge on Non Transferable Subscription Rights       $ 0                
Series T Warrants [Member] | 2018 Rights Offering [Member]                        
Preferred Stock [Abstract]                        
Number of shares callable by warrants (in shares) 1                      
Warrant exercise price   0.7986                    
Warrant exercise price reduced (in dollars per share)   0.15                    
Series T Warrants [Member] | 2018 Rights Offering [Member] | Warrant [Member]                        
Preferred Stock [Abstract]                        
Number of shares callable by warrants (in shares) 50                      
Class of warrant outstanding         3,788,400 3,788,400            
Number of warrants exercised           75,768            
50 Series T Warrants [Member] | 2018 Rights Offering [Member]                        
Preferred Stock [Abstract]                        
Warrant exercise price   $ 7.50