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Nature of Business and Basis of Presentation - Additional Information (Details) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 28 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 01, 2024 USD ($) $ / shares shares | Apr. 10, 2024 USD ($) shares | Apr. 30, 2024 USD ($) shares | Jan. 31, 2024 MW | Oct. 31, 2023 USD ($) Plant MW | Apr. 30, 2023 USD ($) shares | Apr. 30, 2024 USD ($) $ / shares MW shares | Oct. 31, 2023 USD ($) | Oct. 31, 2024 shares
Nature of Business and Basis of Presentation |  |  |  |  |  |  |  |  |
Cash and cash equivalents, unrestricted |  |  | $ 158,790,000 |  | $ 249,952,000 | $ 246,844,000 | $ 158,790,000 | $ 249,952,000 |
Investments - short-term |  |  | 101,340,000 |  | 103,760,000 |  | 101,340,000 | 103,760,000 |
Proceeds from the issuance of debt |  |  |  |  |  |  | 13,000,000 |  |
US Treasury Securities |  |  |  |  |  |  |  |  |
Nature of Business and Basis of Presentation |  |  |  |  |  |  |  |  |
Investments - short-term |  |  | 101,300,000 |  | $ 103,800,000 |  | 101,300,000 | 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 |  |  |  | 13,000,000.0 |  |
Tax equity financing transactions with Franklin Park |  |  |  |  |  |  |  |  |
Nature of Business and Basis of Presentation |  |  |  |  |  |  |  |  |
Closing costs |  |  |  |  |  |  |  | 1,800,000 |
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 |
Amended Open Market Sales Agreement | Subsequent Event |  |  |  |  |  |  |  |  |
Nature of Business and Basis of Presentation |  |  |  |  |  |  |  |  |
Shares sold during the period | shares | 38,600,000 |  |  |  |  |  |  |  |
Average sale price per share | $ / shares | $ 0.84 |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock | $ 31,700,000 |  |  |  |  |  |  |  |
Common stock issuance, net of fees | 32,300,000 |  |  |  |  |  |  |  |
Payments of underwriting discounts and commissions | $ 600,000 |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Nature of Business and Basis of Presentation |  |  |  |  |  |  |  |  |
Shares sold during the period | shares |  |  | 6,463,716 |  |  | 949,438 |  |  |
Common Stock | Amended Open Market Sales Agreement | 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 |  |  |  |  |  |  |  |  |
Nature of Business and Basis of Presentation |  |  |  |  |  |  |  |  |
Shares sold during the period | shares |  | 0 |  |  |  |  | 6,500,000 |  | 6,500,000
Aggregate offering price |  | $ 300.0 |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  |  |  |  | $ 6,300,000 |  |
Average sale price per share | $ / shares |  |  |  |  |  |  | $ 0.98 |  |
Net proceeds from issuance of common stock |  |  |  |  |  |  | $ 5,900,000 |  |
Common stock issuance, net of fees |  |  |  |  |  |  | 5,900,000 |  |
Sales commission |  | $ 100,000 |  |  |  |  | 100,000 |  |
Payments of underwriting discounts and commissions |  |  |  |  |  |  | 300,000 |  |
Offering price |  |  | $ 293,700,000 |  |  |  | $ 293,700,000 |  |
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 |  |

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