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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Spectrum revenues	$ 1,271	$ 578	$ 2,931	$ 1,311
Spectrum revenue | Ameren Corporation
Disaggregation of Revenue [Line Items]
Spectrum revenues	152	152	456	457
Spectrum revenue | Evergy
Disaggregation of Revenue [Line Items]
Spectrum revenues	274	244	822	308
Spectrum revenue | Xcel Energy
Disaggregation of Revenue [Line Items]
Spectrum revenues	663	0	1,107	0
Spectrum revenue | Motorola
Disaggregation of Revenue [Line Items]
Spectrum revenues	$ 182	$ 182	$ 546	$ 546

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