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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Total spectrum revenue	$ 1,566	$ 1,271	$ 4,642	$ 2,931
Spectrum revenue | Ameren Corporation
Disaggregation of Revenue [Line Items]
Total spectrum revenue	197	152	535	456
Spectrum revenue | Evergy
Disaggregation of Revenue [Line Items]
Total spectrum revenue	385	274	1,156	822
Spectrum revenue | Xcel Energy
Disaggregation of Revenue [Line Items]
Total spectrum revenue	801	663	2,404	1,107
Spectrum revenue | Motorola
Disaggregation of Revenue [Line Items]
Total spectrum revenue	$ 183	$ 182	$ 547	$ 546

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