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Nature of Business, Basis of Presentation and Significant Accounting Policies - Additional Information (Details)
 3 Months Ended 12 Months Ended
Dec. 12, 2024
USD ($)
Nov. 08, 2024
shares
Oct. 31, 2024
USD ($)
MW
shares
Apr. 10, 2024
USD ($)
Dec. 16, 2022
MW
Dec. 15, 2022
MW
Jul. 12, 2022
shares
Jan. 31, 2024
MW
Oct. 31, 2023
USD ($)
MW
shares
Oct. 31, 2024
USD ($)
item
MW
shares
Oct. 31, 2023
USD ($)
shares
Oct. 31, 2022
USD ($)
shares
Nov. 07, 2024
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Apr. 25, 2024
USD ($)
Oct. 11, 2023
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Oct. 10, 2023
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Oct. 31, 2021
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Nature of Business and Basis of Presentation                                  
Cash and cash equivalents, unrestricted     $ 148,133,000           $ 249,952,000 $ 148,133,000 $ 249,952,000 $ 458,055,000          
Investments - short-term     109,123,000           103,760,000 109,123,000 103,760,000            
Allowance for doubtful accounts or credit losses     $ 0           $ 0 0 0            
Impairment of goodwill                   $ 0 $ 0 $ 0          
Percentage of electricity output provided to customers                   100.00%              
Common stock, shares outstanding (in shares) | shares     20,375,932           15,020,872 20,375,932 15,020,872            
Common stock, shares authorized (in shares) | shares     1,000,000,000           1,000,000,000 1,000,000,000 1,000,000,000       1,000,000,000 500,000,000  
Extended product warranty description                   We warranty our products for a specific period of time against manufacturing or performance defects. Our U.S. warranty is generally limited to a term of 15 months after shipment or 12 months after acceptance of our products.              
Extended product warranty period after shipment                   15 months              
Extended product warranty period after acceptance of products                   12 months              
Number of fuel cell power plants, tax equity financing transaction                 2                
U.S. Treasury Securities                                  
Nature of Business and Basis of Presentation                                  
Investments - short-term     $ 109,100,000           $ 103,800,000 $ 109,100,000 $ 103,800,000            
Derby Senior Back Leverage Loan Facility and Derby Subordinated Back Leverage Loan Facility                                  
Nature of Business and Basis of Presentation                                  
Debt instrument, face amount                           $ 12,800,000      
EXIM                                  
Nature of Business and Basis of Presentation                                  
Number of fuel cells | item                   42              
Capacity of fuel cell | MW     1.4             1.4              
Proceeds from long-term lines of credit     $ 10,100,000             $ 9,200,000              
Common Stock                                  
Nature of Business and Basis of Presentation                                  
Shares sold during the period | shares                   5,302,378 1,477,361 1,279,897          
Common stock, shares outstanding (in shares) | shares     20,375,932           15,020,872 20,375,932 15,020,872 13,518,743         12,220,600
Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC | Amended Open Market Sales Agreement                                  
Nature of Business and Basis of Presentation                                  
Shares sold during the period | shares                   5,300,000              
Gross proceeds from issuance of common stock to date under the amended sales agreement     $ 95,100,000             $ 95,100,000              
Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC | Amended Open Market Sales Agreement | Common Stock                                  
Nature of Business and Basis of Presentation                                  
Aggregate offering price       $ 300,000,000                          
Shares sold during the period | shares     5,300,000                            
Gross proceeds from issuance of common stock to date under the amended sales agreement     $ 95,100,000           $ 99,700,000 95,100,000 $ 99,700,000            
Franklin Park Tax Equity Financing Transaction [Member]                                  
Nature of Business and Basis of Presentation                                  
Tax equity financing commitment                 30,200,000   30,200,000            
Tax equity financing transaction, commitment amount received                 $ 9,100,000 $ 21,100,000              
Closing costs                     $ 1,800,000            
Derby Project 14.0 Mega Watt                                  
Nature of Business and Basis of Presentation                                  
Capacity of plant | MW                 14 14              
Derby Project 2.8 Mega Watt                                  
Nature of Business and Basis of Presentation                                  
Capacity of plant | MW                 2.8 2.8              
Groton Project                                  
Nature of Business and Basis of Presentation                                  
Capacity of plant | MW         6 7.4                      
Capacity of plant due to Technical Improvement Plan | MW               7.4                  
Contribution received under the Technical Improvement Plan                   $ 4,000,000              
Subsequent Event                                  
Nature of Business and Basis of Presentation                                  
Reverse stock split, conversion ratio   0.033                              
Common stock, shares outstanding (in shares) | shares   20,375,932                     611,278,662        
Common stock, shares authorized (in shares) | shares   1,000,000,000                              
Preferred shares authorized | shares   250,000                              
Subsequent Event | Groton Project                                  
Nature of Business and Basis of Presentation                                  
Tax equity financing transaction, commitment amount received $ 4,000,000                                
Maximum                                  
Nature of Business and Basis of Presentation                                  
Operating and finance lease, remaining lease term                   21 years              
Maximum | Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC | Amended Open Market Sales Agreement | Common Stock                                  
Nature of Business and Basis of Presentation                                  
Shares sold during the period | shares             3,200,000                    
Minimum                                  
Nature of Business and Basis of Presentation                                  
Operating and finance lease, remaining lease term                   1 year