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Stockholders' Equity and Warrant Liabilities - Additional Information (Details) - USD ($)
 12 Months Ended
Oct. 04, 2019
Feb. 21, 2019
Jun. 13, 2018
May 03, 2017
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Jan. 14, 2020
Nov. 22, 2019
May 08, 2019
Apr. 30, 2019
Apr. 04, 2019
Dec. 14, 2017
Apr. 30, 2017
Oct. 31, 2016
Stockholders' Equity Note                              
Common stock, shares authorized         225,000,000 225,000,000 125,000,000     225,000,000         75,000,000
Common stock, par value         $ 0.0001 $ 0.0001                  
Number of shares reserved for future issuance and sale                           4,500,000  
Common stock, shares issued         193,608,684 7,972,686                  
Common stock price per share         $ 0.24           $ 3.12        
Class of Warrant or Right, Outstanding [1]         6,000,000                    
Expected volatility         96.00%                    
Risk-free interest rate         1.63% 2.80% 2.20%                
Expected life (years)         8 years 7 years 7 years                
Class of warrants or rights issued value         $ 3,900                    
Excess percentage of common shares outstanding                       19.90% 19.90%    
Subsequent Event [Member]                              
Stockholders' Equity Note                              
Number of shares reserved for future issuance and sale               10,290,934              
Exchange Agreement [Member]                              
Stockholders' Equity Note                              
Common stock issued to warrant holders   500,000                          
Series C Warrants [Member]                              
Stockholders' Equity Note                              
Class of Warrant or Right, Outstanding         964,114 964,114                  
Series A Warrants [Member]                              
Stockholders' Equity Note                              
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 69.96                  
Class of Warrant or Right, Outstanding           640,000                  
Series A Warrants [Member] | Exchange Agreement [Member]                              
Stockholders' Equity Note                              
Fair value of the warrant pre-modification         $ 300,000                    
Fair value of the shares at the date of the Exchange Agreement         $ 3,500,000                    
Series B Warrants [Member]                              
Stockholders' Equity Note                              
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 0.0012                  
Class of Warrant or Right, Outstanding           410,500                 318,834
Maximum [Member]                              
Stockholders' Equity Note                              
Common stock, shares authorized                       335,000,000      
Minimum [Member]                              
Stockholders' Equity Note                              
Common stock, shares authorized                       225,000,000      
Orion Credit Agreement [Member]                              
Stockholders' Equity Note                              
Beneficial ownership, limitation on exercise of warrants         4.99%                    
Orion Credit Agreement [Member] | Initial Funding Warrants [Member]                              
Stockholders' Equity Note                              
Class of warrants or rights issued         6,000,000                    
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 0.310                    
Class of warrant or right term         8 years                    
Orion Credit Agreement [Member] | Second Funding Warrants [Member] | Subsequent Event [Member]                              
Stockholders' Equity Note                              
Class of warrants or rights issued                 14,000,000            
Orion Credit Agreement [Member] | Second Funding Warrants [Member] | Exercise Price 0.242 [Member] | Subsequent Event [Member]                              
Stockholders' Equity Note                              
Class of warrants or rights issued                 8,000,000            
Class of Warrant or Right, Exercise Price of Warrants or Rights                 $ 0.242            
Orion Credit Agreement [Member] | Second Funding Warrants [Member] | Exercise Price 0.620 [Member] | Subsequent Event [Member]                              
Stockholders' Equity Note                              
Class of warrants or rights issued                 6,000,000            
Class of Warrant or Right, Exercise Price of Warrants or Rights                 $ 0.620            
At Market Issuance Sales Agreement [Member] | B. Riley FBR, Inc [Member]                              
Stockholders' Equity Note                              
Percentage of sales commission 3.00%                            
Number of shares reserved for future issuance and sale 27,900,000                            
Reserve for issuance of common stock upon exercise of warrants shares         20,000,000                    
At Market Issuance Sales Agreement [Member] | B. Riley FBR, Inc [Member] | Maximum [Member]                              
Stockholders' Equity Note                              
Aggregate offering price $ 38,000,000                            
Number of shares reserved for future issuance and sale         7,900,000                    
Common stock, shares issued         18,000,000                    
At Market Issuance Sales Agreement [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member]                              
Stockholders' Equity Note                              
Percentage of sales commission     3.00%                        
At Market Issuance Sales Agreement [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member] | Maximum [Member]                              
Stockholders' Equity Note                              
Aggregate offering price     $ 50,000,000                        
Underwritten Public Offering [Member]                              
Stockholders' Equity Note                              
Stock issued during period, shares, new issues       1,000,000                      
Gross proceeds from common stock and warrants       $ 15,400,000                      
Common stock price per share       $ 15.36                      
Net proceeds from common stock and warrants       $ 13,900,000                      
Underwritten Public Offering [Member] | Series C Warrants [Member]                              
Stockholders' Equity Note                              
Class of warrants or rights issued       1,000,000                      
Warrants issued, price per share       $ 15.36                      
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 19.20                      
Class of warrant or right term       5 years                      
Underwritten Public Offering [Member] | Series D Warrants [Member]                              
Stockholders' Equity Note                              
Class of warrants or rights issued       1,000,000                      
Warrants issued, price per share       $ 15.36                      
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 15.36                      
Class of warrant or right term       1 year                      
Common Stock [Member]                              
Stockholders' Equity Note                              
Stock issued during period, shares, new issues         119,128,677 476,265 603,786                
Common Stock [Member] | Series C Warrants [Member]                              
Stockholders' Equity Note                              
Stock issued during period, shares, new issues         0 962                  
Net proceeds from common stock and warrants           $ 20,000                  
Common Stock [Member] | Series D Warrants [Member]                              
Stockholders' Equity Note                              
Stock issued during period, shares, new issues           215,347                  
Net proceeds from common stock and warrants           $ 3,300,000                  
Common Stock [Member] | At Market Issuance Sales Agreement [Member]                              
Stockholders' Equity Note                              
Stock issued during period, shares, new issues             600,000                
Stock issued during period on sales agreement             $ 12,600,000                
Sale of common stock net of fees             $ 100,000                
Average sale price             $ 21.00                
Common Stock [Member] | At Market Issuance Sales Agreement [Member] | B. Riley FBR, Inc [Member]                              
Stockholders' Equity Note                              
Stock issued during period, shares, new issues         10,100,000                    
Stock issued during period on sales agreement         $ 3,000,000                    
Sale of common stock net of fees         $ 100,000                    
Common Stock [Member] | At Market Issuance Sales Agreement [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member]                              
Stockholders' Equity Note                              
Stock issued during period, shares, new issues         109,100,000 500,000                  
Stock issued during period on sales agreement         $ 42,000,000 $ 8,000,000                  
Sale of common stock net of fees         $ 1,300,000 $ 200,000                  
Average sale price         $ 0.39 $ 16.72                  
Warrant [Member]                              
Stockholders' Equity Note                              
Class of warrants or rights issued         20,000,000                    
Warrant [Member] | Second Funding Warrants [Member]                              
Stockholders' Equity Note                              
Percentage of warrants vesting         100.00%                    
[1] The Second Funding Warrants, exercisable to purchase 14.0 million shares of the Company’s common stock, were contingently issuable in connection with the Second Funding under the Orion Credit Agreement, which occurred on November 22, 2019. The Company accounted for the value of the Orion Warrants, which were exercisable to purchase an aggregate of 20.0 million shares of the Company’s common stock, as a liability as of October 31, 2019.