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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 |  |  |  |  |  |  |  |  |  |

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