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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total spectrum revenue	$ 6,031	$ 4,191
Total spectrum revenue
Disaggregation of Revenue [Line Items]
Total spectrum revenue	6,031	4,191
Ameren | Total spectrum revenue
Disaggregation of Revenue [Line Items]
Total spectrum revenue	737	609
Evergy | Total spectrum revenue
Disaggregation of Revenue [Line Items]
Total spectrum revenue	1,542	966
Xcel Energy | Total spectrum revenue
Disaggregation of Revenue [Line Items]
Total spectrum revenue	3,205	1,887
Motorola | Total spectrum revenue
Disaggregation of Revenue [Line Items]
Total spectrum revenue	$ 547	$ 729

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