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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total spectrum revenue	$ 1,418	$ 1,525
Spectrum revenue | Ameren Corporation
Disaggregation of Revenue [Line Items]
Total spectrum revenue	206	156
Spectrum revenue | Evergy
Disaggregation of Revenue [Line Items]
Total spectrum revenue	385	386
Spectrum revenue | Xcel Energy
Disaggregation of Revenue [Line Items]
Total spectrum revenue	801	801
Spectrum revenue | TECO
Disaggregation of Revenue [Line Items]
Total spectrum revenue	26	0
Spectrum revenue | Motorola
Disaggregation of Revenue [Line Items]
Total spectrum revenue	$ 0	$ 182

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