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Nature of Business and Basis of Presentation - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended | 19 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 31, 2023 USD ($) | Jan. 31, 2024 USD ($) MW shares | Oct. 31, 2023 USD ($) Plant MW | Oct. 31, 2023 USD ($) | Jan. 31, 2024 USD ($) shares | Jan. 31, 2023 USD ($)
Nature of Business and Basis of Presentation |  |  |  |  |  |
Cash and cash equivalents, unrestricted | $ 249,952 | $ 297,466 | $ 249,952 | $ 249,952 | $ 297,466 | $ 315,168
Investments - short-term | 103,760 |  | 103,760 | 103,760 |  |
US Treasury Securities |  |  |  |  |  |
Nature of Business and Basis of Presentation |  |  |  |  |  |
Investments - short-term | 103,800 | 0 | $ 103,800 | 103,800 | $ 0 |
Tax equity financing transactions with Franklin Park |  |  |  |  |  |
Nature of Business and Basis of Presentation |  |  |  |  |  |
Closing costs |  |  |  | 1,800 |  |
Number of Fuel Cell Power Plants, Tax Equity Financing Transaction | Plant |  |  | 2 |  |  |
Tax Equity Financing Commitment | 30,200 |  | $ 30,200 | $ 30,200 |  |
Tax equity financing transaction, commitment amount received | $ 9,100 | $ 21,100 |  |  |  |
Common Stock | 2022 Open Market Sale 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 |  |  | 62,800,000 |
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 | MW |  | 7.4 |  |  |  |
Tax equity financing transaction, commitment amount received |  | $ 4,000 |  |  |  |

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