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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Spectrum revenues	$ 608	$ 335
Spectrum revenue | Ameren
Disaggregation of Revenue [Line Items]
Spectrum revenues	152	153
Spectrum revenue | Evergy(1)
Disaggregation of Revenue [Line Items]
Spectrum revenues	274	0
Spectrum revenue | Motorola
Disaggregation of Revenue [Line Items]
Spectrum revenues	$ 182	$ 182

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