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v3.23.3

Contingencies and Guaranty (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Jul. 31, 2023 | Oct. 31, 2022 | Sep. 30, 2022 | Feb. 28, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  | $ 20,000 |  |  |  |  |  |  |
Contingent liability | $ 1,409 |  |  |  |  | $ 1,409 |  | $ 1,409 |  | $ 20,249 |  |
Prepayments received | 80,265 |  |  | $ 53,945 |  | 80,265 | $ 53,945 | 80,265 | $ 53,945 | $ 60,759 |  | $ 54,678
Spectrum revenues |  |  |  |  |  | 1,052 | 398 | 1,660 | 733 |  |  |
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Milestone payment received | 25,200 |  |  | $ 200 |  |  |  |  |  |  |  |
Delivery delay adjustments | 1,100 |  |  |  |  |  |  |  |  |  |  |
Xcel Energy | Spectrum revenue |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spectrum revenues |  |  |  |  |  | 444 | $ 0 | 444 | $ 0 |  |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Milestone payment received |  | $ 21,200 |  |  |  |  |  |  |  |  |  |
Agreement term |  |  | 20 years |  |  |  |  |  |  |  |  |
Prepayments received | 29,200 |  |  |  |  | 29,200 |  | 29,200 |  |  | $ 8,000 |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Prepayments received | $ 28,800 |  |  |  |  | $ 28,800 |  | $ 28,800 |  |  |  |
SDG&E |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  | $ 50,000 |  |  |  |  |  |  |

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