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Nature of Business and Basis of Presentation - Additional Information (Details)
 3 Months Ended 4 Months Ended 9 Months Ended 12 Months Ended
Aug. 01, 2024
USD ($)
$ / shares
shares
Apr. 10, 2024
USD ($)
$ / shares
Jul. 31, 2024
USD ($)
$ / shares
shares
Apr. 30, 2024
USD ($)
shares
Jan. 31, 2024
MW
Oct. 31, 2023
USD ($)
Plant
MW
Jul. 31, 2023
USD ($)
shares
Apr. 30, 2023
shares
Jul. 31, 2024
USD ($)
$ / shares
shares
Jul. 31, 2024
USD ($)
$ / shares
MW
shares
Oct. 31, 2023
USD ($)
Nature of Business and Basis of Presentation                      
Cash and cash equivalents, unrestricted     $ 159,347,000     $ 249,952,000 $ 303,679,000   $ 159,347,000 $ 159,347,000 $ 249,952,000
Investments - short-term     107,817,000     103,760,000     107,817,000 107,817,000 103,760,000
US Treasury Securities                      
Nature of Business and Basis of Presentation                      
Investments - short-term     $ 107,800,000     $ 103,800,000     $ 107,800,000 $ 107,800,000 103,800,000
Derby Senior Back Leverage Loan Facility and Derby Subordinated Back Leverage Loan Facility                      
Nature of Business and Basis of Presentation                      
Debt instrument, face amount       $ 13,000,000.0              
Common Stock                      
Nature of Business and Basis of Presentation                      
Shares sold during the period | shares     95,220,151 6,463,716     37,931,204 949,438      
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   $ 300,000,000.0                  
Shares sold during the period | shares                 101,700,000 101,700,000  
Average sale price per share for sales to date under the amended sales agreement | $ / shares   $ 0.72 $ 0.72           $ 0.72 $ 0.72  
Gross proceeds from issuance of common stock to date under the amended sales agreement   $ 73,600,000 $ 73,600,000           $ 73,600,000 $ 73,600,000  
Net proceeds from issuance of common stock to date under the amended sales agreement   71,700,000                  
Common stock issuance, net of fees                   71,700,000  
Sales commission   1,500,000 $ 1,300,000             1,500,000  
Payments of underwriting discounts and commissions   $ 400,000               400,000  
Tax equity financing transactions with Franklin Park                      
Nature of Business and Basis of Presentation                      
Number of Fuel Cell Power Plants, Tax Equity Financing Transaction | Plant           2          
Tax Equity Financing Commitment           $ 30,200,000         30,200,000
Tax equity financing transaction, commitment amount received                   $ 21,100,000 9,100,000
Closing costs                     $ 1,800,000
Derby Project 14.0 Mega Watt                      
Nature of Business and Basis of Presentation                      
Capacity of plant | MW                   14.0  
Derby Project 14.0 Mega Watt | Tax equity financing transactions with Franklin Park                      
Nature of Business and Basis of Presentation                      
Capacity of plant | MW           14.0          
Derby Project 2.8 Mega Watt                      
Nature of Business and Basis of Presentation                      
Capacity of plant | MW                   2.8  
Derby Project 2.8 Mega Watt | Tax equity financing transactions with Franklin Park                      
Nature of Business and Basis of Presentation                      
Capacity of plant | MW           2.8          
Groton Project                      
Nature of Business and Basis of Presentation                      
Capacity of plant due to Technical Improvement Plan | MW         7.4            
Contribution received under the Technical Improvement Plan                   $ 4,000,000.0  
Subsequent Event | Amended Open Market Sales Agreement                      
Nature of Business and Basis of Presentation                      
Shares sold during the period | shares 2,200,000                    
Average sale price per share for sales to date under the amended sales agreement | $ / shares $ 0.51                    
Net proceeds from issuance of common stock to date under the amended sales agreement $ 1,100,000                    
Common stock issuance, net of fees 1,100,000                    
Payments of underwriting discounts and commissions $ 21,900