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Stockholders' Equity and Warrant Liabilities - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 07, 2020
Dec. 04, 2020
Jan. 08, 2020
Nov. 22, 2019
Oct. 31, 2019
May 03, 2017
Apr. 30, 2021
Jan. 31, 2021
Apr. 30, 2020
Jan. 31, 2020
Apr. 30, 2021
Apr. 30, 2020
Apr. 08, 2021
Oct. 31, 2020
Apr. 08, 2020
Apr. 07, 2020
Stockholders' Equity Note                                
Number of incremental common stock shares approved                         162,500,000      
Common stock, shares authorized             500,000,000       500,000,000     337,500,000 500,000,000 337,500,000
Sale of stock, price per share   $ 7.95 $ 2.29           $ 2.02 $ 1.59   $ 2.02        
Common stock issuance, net of fees                     $ 156,368          
Class of warrants or rights issued                   9,396,320            
Class of warrants or rights exercised                   12,000,000            
Expected volatility 117.02%   103.70%             104.90%   107.40%        
Risk-free interest rate 0.70%   1.81%             1.45%   0.57%        
Class of warrants or rights charge     $ 23,700         $ 16,000 $ 3,400 $ 10,500            
Reclassification of estimated fair value of warrant liability to additional paid in capital $ 21,200   $ 26,000                          
Common Stock [Member]                                
Stockholders' Equity Note                                
Stock issued during period shares new issues               25,000,000   7,938,228            
Orion Energy Partners Investment Agent, LLC Credit Facility [Member]                                
Stockholders' Equity Note                                
Class of warrants or rights exercised                           2,700,000    
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Exercise Price 0.242 [Member]                                
Stockholders' Equity Note                                
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.242                              
Class of warrants or rights issued 2,700,000                              
Class of warrants or rights issued value $ 653,400                              
Orion Energy Partners Investment Agent, LLC Credit Facility [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                      
Drew down to fully repay debt outstanding         $ 14,500                      
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Second Funding Warrants [Member]                                
Stockholders' Equity Note                                
Class of warrants or rights issued       14,000,000                        
Drew down to fully repay debt outstanding       $ 65,500                        
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Second Funding Warrants [Member] | Exercise Price 0.242 [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 Energy Partners Investment Agent, LLC Credit Facility [Member] | Second Funding Warrants [Member] | Exercise Price 0.620 [Member]                                
Stockholders' Equity Note                                
Class of warrants or rights issued       6,000,000                        
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 0.62                        
Underwriting Agreement [Member]                                
Stockholders' Equity Note                                
Stock issued to underwriters   19,822,219                            
Sale of stock, number of shares issued in transaction   14,696,320                            
Sale of stock, price per share   $ 6.50                            
Stock issued during period shares new issues   25,000,000                            
Common stock issuance, net of fees   $ 162,500                            
Underwriting discounts and commissions   $ 0.2275                            
Net proceeds from issuance of common stock   $ 156,400                            
Underwriting Agreement [Member] | Maximum [Member]                                
Stockholders' Equity Note                                
Option to purchase additional common stock shares   5,177,781                            
Underwritten Public Offering [Member]                                
Stockholders' Equity Note                                
Stock issued during period shares new issues           1,000,000                    
Underwritten Public Offering [Member] | May 2017 Offering - Series C Warrants                                
Stockholders' Equity Note                                
Class of warrants or rights issued           1,000,000                    
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] | Common Stock [Member] | May 2017 Offering - Series C Warrants                                
Stockholders' Equity Note                                
Class of warrants or rights exercised             14,026       14,026          
Proceeds from warrant exercises             $ 300       $ 300