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Contingencies and Guaranty (Details) $ in Thousands, people in Millions	1 Months Ended									3 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($)	Nov. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jul. 31, 2023 USD ($)	Apr. 30, 2023 USD ($)	Oct. 31, 2022	Sep. 30, 2022 USD ($)	Feb. 28, 2021 USD ($) people	Dec. 31, 2020 people	Dec. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)
Commitments And Contingencies [Line Items]
Number of people | people								3.6	7.5
Contingent liability								$ 20,000			$ 15,000	$ 0
Derecognition of contingent liability related to sale of intangible assets											19,249	0
Contingent liability											1,000	20,249
Payments to acquire intangible assets											17,031	25,004
Increase in deposit assets										$ 7,500	7,500
Prepayments received											122,212	$ 60,759		$ 54,678
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											67,100		$ 8,000
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum
Commitments And Contingencies [Line Items]
Prepayments received											65,200
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Milestone payment received	$ 200		$ 25,200				$ 200
Milestone delivery delay adjustments			$ 1,100
Lower Colorado River Authority (LCRA) | Wireless Licenses
Commitments And Contingencies [Line Items]
Payments to acquire intangible assets					$ 30,000
Lower Colorado River Authority (LCRA) | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Initial payment received										$ 15,000	$ 15,000
SDG&E
Commitments And Contingencies [Line Items]
Consideration transferred								$ 50,000

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