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Revenue Recognition - Additional Information (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 28, 2024 USD ($) item MW | May 31, 2023 USD ($) | Jul. 31, 2024 USD ($) T | Jul. 31, 2023 USD ($) | Jul. 31, 2024 USD ($) T | Jul. 31, 2023 USD ($) | Oct. 31, 2023 USD ($) | Oct. 31, 2022 USD ($) | Mar. 31, 2024 USD ($) | Jan. 31, 2024 USD ($)
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Contract asset |  |  | $ 50,100 |  | $ 50,100 |  | $ 42,100 |  |  |
Contract asset, long-term |  |  | 19,900 |  | 19,900 |  | 25,800 |  |  |
Contract liability |  |  | 12,600 |  | 12,600 |  | 3,100 |  |  |
Revenues |  |  | $ 23,695 | $ 25,510 | 62,806 | $ 100,932 |  |  |  |
Amount of long-term service agreement | $ 159,600 |  |  |  |  |  |  |  |  |
Toyota Investment Tax Credit Sale |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Consideration payable |  |  |  |  |  |  | 6,300 |  |  |
Consideration payable, long term |  |  |  |  |  |  | 6,000 |  |  |
Sale of investment tax credit |  |  |  |  |  |  | $ 6,300 |  |  |
Hydrogen production and power purchase agreement |  |  |  |  |  |  | 20 years |  |  |
EMTEC Joint Development Agreement |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Contract liability |  |  |  |  |  |  |  |  |  | $ 11,600
Revenues |  | $ 2,500 |  |  | $ 1,400 |  |  |  |  |
Discount on purchase of fuel cell module |  |  |  |  |  |  | $ 2,500 |  |  |
Milestone payment received |  |  |  |  |  |  |  | $ 5,000 |  |
Remaining balance |  | $ 2,500 |  |  |  |  |  |  |  |
Milestone based payments |  |  |  |  |  |  |  | $ 5,000 |  |
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 |
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 | T |  |  | 250,000 |  | 250,000 |  |  |  |  |
Service |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 1,411 | 9,841 | $ 4,397 | 49,913 |  |  |  |
Generation |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Revenues |  |  | 13,402 | 10,982 | 38,013 | 28,979 |  |  |  |
Remaining performance obligations |  |  | $ 396,400 |  | $ 396,400 |  |  |  |  |
Generation | Maximum |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  | 20 years |  | 20 years |  |  |  |  |
Generation | Minimum |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  | 19 years |  | 19 years |  |  |  |  |
Advanced Technologies |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 8,632 | $ 4,687 | $ 20,146 | 12,945 |  |  |  |
Remaining performance obligations |  |  | $ 10,900 |  | $ 10,900 |  |  |  |  |
Advanced Technologies | Maximum |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  | 2 years |  | 2 years |  |  |  |  |
Product |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 250 |  | $ 250 | $ 9,095 |  |  |  |
Remaining performance obligations |  |  | 136,700 |  | 136,700 |  |  |  |  |
Service Agreements | Service |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Remaining performance obligations |  |  | $ 178,400 |  | $ 178,400 |  |  |  |  |
Service Agreements | Service | Maximum |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  | 15 years |  | 15 years |  |  |  |  |
Service Agreements | Service | Minimum |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Revenue performance obligation expected timing of satisfaction |  |  | 3 years |  | 3 years |  |  |  |  |

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