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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Spectrum revenues	$ 1,052	$ 398	$ 1,660	$ 733
Spectrum revenue | Ameren Corporation
Disaggregation of Revenue [Line Items]
Spectrum revenues	152	152	304	305
Spectrum revenue | Evergy
Disaggregation of Revenue [Line Items]
Spectrum revenues	274	64	548	64
Spectrum revenue | Xcel Energy
Disaggregation of Revenue [Line Items]
Spectrum revenues	444	0	444	0
Spectrum revenue | Motorola
Disaggregation of Revenue [Line Items]
Spectrum revenues	$ 182	$ 182	$ 364	$ 364

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