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Nature of Business, Basis of Presentation and Significant Accounting Policies - Additional Information (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 01, 2020
Nov. 30, 2019
USD ($)
Nov. 22, 2019
USD ($)
Nov. 05, 2019
USD ($)
Jul. 31, 2019
USD ($)
May 08, 2019
shares
Nov. 01, 2018
USD ($)
Aug. 29, 2017
USD ($)
MW
Jun. 30, 2017
MW
Oct. 31, 2017
USD ($)
shares
Oct. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
shares
Oct. 31, 2018
USD ($)
shares
Oct. 31, 2017
USD ($)
shares
Jan. 14, 2020
shares
Jan. 10, 2020
shares
May 09, 2019
USD ($)
May 07, 2019
shares
Apr. 04, 2019
shares
Apr. 30, 2017
shares
Oct. 31, 2016
shares
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Reverse stock split           1-for-12 reverse stock split                              
Reverse stock split, conversion ratio           0.084                              
Common stock, shares outstanding | shares           15,284,269           193,608,684 7,972,686         183,411,230      
Common stock, shares authorized | shares           225,000,000       125,000,000   225,000,000 225,000,000 125,000,000             75,000,000
Preferred stock, shares authorized | shares           250,000           250,000                  
Research and development expenses                       $ 13,786,000 $ 22,817,000 $ 20,398,000              
Common stock, shares reserved for issuance | shares                                       4,500,000  
Restricted Cash and Cash Equivalents                       30,300,000 40,900,000                
Restricted cash and cash equivalents - long-term                       26,871,000 35,142,000                
Reserves for obligations                       17,900,000 17,700,000                
Letters of Credit Outstanding, Amount                       $ 5,700,000 3,800,000                
Letter of Credit Date of Expiration                       Aug. 01, 2025                  
Impairment charges         $ 0             $ 0 0 0              
Extended Product Warranty Description                       We warranty our products for a specific period of time against manufacturing or performance defects. Our U.S. warranty is limited to a term generally 15 months after shipment or 12 months after acceptance of our products.                  
Product Warranty Accrual [1]                       $ 144,000 147,000                
Reserve for Performance Guarantees                       800,000 1,100,000                
Loss reserve on service agreements                       3,300,000 900,000                
Long-term stack residual value [2]                       987,000 1,206,000                
Foreign Currency Transaction (Losses) Gains, Net                       (100,000) $ 300,000 $ (700,000)              
Operating lease liability                       10,300,000                  
ROU assets                       $ 10,100,000                  
ASU 2014-09 [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Cumulative effect adjustment increase in Accumulated deficit             $ 6,700,000                            
Sales Revenue Net [Member] | Customer Concentration Risk [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Significant customer revenue percentage                       80.00% 86.00% 79.00%              
Bridgeport Fuel Cell Project [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Restricted cash                                 $ 15,000,000        
Dominion Bridgeport FuelCell Park [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Restricted cash and cash equivalents - long-term                         $ 15,000,000                
Restricted cash and cash equivalents - long-term service agreement                       15 years                  
Dominion Bridgeport FuelCell Park [Member] | Sales Revenue Net [Member] | Customer Concentration Risk [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Significant customer revenue percentage                       13.00% 3.00% 11.00%              
Hanyang Industrial Development Co., Ltd [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Number of MW awarded | MW                 20                        
Contract to sell fuel cell plants | MW               20                          
Project represented value of contract               $ 70,000,000                          
Hanyang Industrial Development Co., Ltd [Member] | Electricity [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Revenue                   $ 39,000,000     $ 31,000,000                
Common Stock [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Common stock, shares outstanding | shares                   5,791,068   193,608,684 7,972,686 5,791,068             2,931,202
Series 1 Preferred Shares [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Preferred stock, dividend rate, percentage                       5.00%                  
Joint Development Agreement [Member] | Scenario Forecast [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Milestone payments eligible for achievement                     $ 5,000,000                    
Maximum [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Common stock, shares authorized | shares                                     335,000,000    
Minimum [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Common stock, shares authorized | shares                                     225,000,000    
Subsequent Event [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Common stock, shares reserved for issuance | shares                             10,290,934            
Subsequent Event [Member] | Common Stock [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Common stock, shares available for issuance | shares                             14,034,001            
Subsequent Event [Member] | Series 1 Preferred Shares [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Preferred stock, dividend rate, percentage 15.00%                                        
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Scenario Forecast [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Common stock, shares reserved for issuance | shares                               2,603,681          
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Subsequent Event [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Drew down to fully repay debt outstanding     $ 80,000,000                                    
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Senior Secured Credit Facility [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Long-term line of credit                       $ 200,000,000                  
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Initial Funding [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Drew down to fully repay debt outstanding                       14,500,000                  
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Second Funding [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Drew down to fully repay debt outstanding                       65,500,000                  
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Second Funding [Member] | Subsequent Event [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Drew down to fully repay debt outstanding     $ 65,500,000                                    
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Remainder of Funding [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Line of credit receivable amount                       120,000,000                  
Exxon Mobile Research And Engineering Company [Member] | Subsequent Event [Member] | Joint Development Agreement [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Payment for exclusivity and technology access fee   $ 5,000,000   $ 5,000,000                                  
Exxon Mobile Research And Engineering Company [Member] | Subsequent Event [Member] | Maximum [Member] | Joint Development Agreement [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Research and development expenses   45,000,000   45,000,000                                  
Milestone-based payments   $ 10,000,000   $ 10,000,000                                  
Financing and License Arrangement [Member] | Exxon Mobile Research And Engineering Company [Member]                                          
Nature of Business, Basis of Presentation and Significant Accounting Policies [Line items]                                          
Up-front proceeds                       $ 10,000,000                  
[1] Activity in the accrued product warranty costs for the years ended October 31, 2019 and 2018 included additions for estimates of future warranty obligations of $0.1 million and $0.4 million, respectively, on contracts in the warranty period and reductions related to actual warranty spend of $0.1 million and $0.6 million, respectively, as contracts progress through the warranty period or are beyond the warranty period.
[2] Relates to estimated residual value for module exchanges performed under the Company’s service agreements where the useful life extends beyond the contractual term of the service agreement and the Company obtains title for the module from the customer upon expiration or non-renewal of the service agreement.  If the Company does not obtain rights to title from the customer, the full cost of the module is expensed at the time of the module exchange.