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Contingencies and Guaranty (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 45 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Nov. 30, 2023 | Sep. 30, 2023 | Jul. 31, 2023 | Oct. 31, 2022 | Sep. 30, 2022 | Feb. 28, 2021 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2026 | Mar. 31, 2023 | Mar. 31, 2022
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability | $ 15,000 |  |  |  |  |  | $ 20,000 | $ 15,000 |  |  | $ 15,000 |  |  | $ 0 |
Contingent liability | 1,000 |  |  |  |  |  |  | 1,000 |  |  | 1,000 |  |  | 20,249 |
Payments to acquire intangible assets |  |  |  |  |  |  |  |  |  |  | 14,809 | $ 19,069 |  |  |
Increase in deposit assets |  |  |  |  |  |  |  | 7,500 |  |  |  |  |  |  |
Prepayments received | 107,060 |  | $ 80,265 |  |  | $ 53,945 |  | 107,060 | $ 80,265 | $ 61,367 | 107,060 | 61,367 |  | $ 60,759 | $ 54,678
Spectrum revenues |  |  |  |  |  |  |  | 1,271 |  | 578 | 2,931 | 1,311 |  |  |
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payment received | 200 |  | 25,200 |  |  | $ 200 |  | 200 | $ 25,200 |  |  |  |  |  |
Delivery delay adjustments |  |  | $ 1,100 |  |  |  |  |  |  |  |  |  |  |  |
Xcel Energy | Spectrum revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spectrum revenues |  |  |  |  |  |  |  | 663 |  | 0 | 1,107 | 0 |  |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payment received |  | $ 21,200 |  | $ 21,200 |  |  |  |  |  |  |  |  |  |  |
Agreement term |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |
Prepayments received | 50,300 |  |  |  |  |  |  | 50,300 |  | $ 8,000 | 50,300 | $ 8,000 |  |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayments received | $ 49,200 |  |  |  |  |  |  | $ 49,200 |  |  | $ 49,200 |  |  |  |
Lower Colorado River Authority (LCRA) | Forecast | Licensing Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000 |  |
SDG&E |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  |

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