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Revenue Recognition - Additional Information (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 28, 2024 USD ($) item MW | May 31, 2023 USD ($) | Jan. 31, 2025 USD ($) | Jan. 31, 2024 USD ($) | Oct. 31, 2024 USD ($) | Oct. 31, 2023 USD ($) | Oct. 31, 2022 USD ($) | Mar. 31, 2024 USD ($)
Revenue Recognition |  |  |  |  |  |  |  |
Contract asset |  |  | $ 65,700,000 |  | $ 65,100,000 |  |  |
Contract asset, long-term |  |  | 23,800,000 |  | 28,300,000 |  |  |
Contract liability |  |  | 8,300,000 |  | 7,200,000 |  |  |
Revenues |  |  | 18,997,000 | $ 16,691,000 |  |  |  |
Amount of long-term service agreement | $ 159,600,000 |  |  |  |  |  |  |
Toyota Investment Tax Credit Sale |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Consideration payable |  |  | 6,000,000 |  | 6,000,000 | $ 6,300,000 |  |
Consideration payable, long term |  |  | 4,500,000 |  | 4,500,000 | 6,000,000 |  |
Sale of investment tax credit |  |  |  |  |  | $ 6,300,000 |  |
Hydrogen production and power purchase agreement |  |  |  |  |  | 20 years |  |
EMTEC Joint Development Agreement |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Contract liability |  |  | 12,600,000 | 11,600,000 |  |  |  |
Change order to the original purchase order |  |  | 1,000,000 |  |  |  |  |
Revenues |  | $ 2,500,000 | $ 500,000 |  | $ 2,000,000 | $ 2,000,000 |  |
Discount on purchase of fuel cell module |  |  |  |  |  | $ 2,500,000 |  |
Milestone payment received |  |  |  |  |  |  | $ 5,000,000 |
Remaining balance |  | $ 2,500,000 |  |  |  |  |  |
Milestone based payments |  |  |  |  |  |  | $ 5,000,000 |
Amendment No 5 to EMTEC Joint Development Agreement |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Minimum expected annual budget for the anticipated work through the remaining term of agreement |  |  |  |  |  |  |  | $ 10,000,000
GGE |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Capacity of plant | MW | 58.8 |  |  |  |  |  |  |
Number of plants | item | 21 |  |  |  |  |  |  |
Number of cells per plant | item | 2 |  |  |  |  |  |  |
Number of fuel cells | item | 42 |  |  |  |  |  |  |
Capacity of fuel cell | MW | 1.4 |  |  |  |  |  |  |
Long term service agreement term | 7 years |  |  |  |  |  |  |
GGE | Fall 2024 |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Capacity of fuel cell | MW | 1.4 |  |  |  |  |  |  |
GGE | Calendar Year 2025 |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Number of fuel cells | item | 30 |  |  |  |  |  |  |
Capacity of fuel cell | MW | 1.4 |  |  |  |  |  |  |
GGE | First Half Calendar Year 2026 |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Number of fuel cells | item | 6 |  |  |  |  |  |  |
Capacity of fuel cell | MW | 1.4 |  |  |  |  |  |  |
Maximum | Amendment No 5 to EMTEC Joint Development Agreement |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
CO2 capture annual basis |  |  | 250,000 |  |  |  |  |
Service |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Revenues |  |  | $ 1,848,000 | 1,617,000 |  |  |  |
Generation |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Revenues |  |  | 11,346,000 | 10,493,000 |  |  |  |
Remaining performance obligations |  |  | $ 385,000,000 |  |  |  |  |
Generation | Maximum |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  | 20 years |  |  |  |  |
Generation | Minimum |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  | 19 years |  |  |  |  |
Advanced Technologies |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Revenues |  |  | $ 5,731,000 | $ 4,581,000 |  |  |  |
Remaining performance obligations |  |  | $ 9,400,000 |  |  |  |  |
Advanced Technologies | Maximum |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  | 2 years |  |  |  |  |
Product |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Revenues |  |  | $ 72,000 |  |  |  |  |
Remaining performance obligations |  |  | 111,200,000 |  |  |  |  |
Service Agreements | Service |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Remaining performance obligations |  |  | $ 172,300,000 |  |  |  |  |
Service Agreements | Service | Maximum |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  | 15 years |  |  |  |  |
Service Agreements | Service | Minimum |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  | 3 years |  |  |  |  |

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