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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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