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Nature of Business, Basis of Presentation and Significant Accounting Policies - Additional Information (Details) |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
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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 ($) shares | Nov. 07, 2024 shares | Apr. 25, 2024 USD ($) | Oct. 11, 2023 shares | Oct. 10, 2023 shares | Oct. 31, 2021 shares
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 |  |  |  |  |  |  |

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