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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Spectrum revenues	$ 335	$ 182
Spectrum revenue | Ameren
Disaggregation of Revenue [Line Items]
Spectrum revenues	153	0
Spectrum revenue | Motorola
Disaggregation of Revenue [Line Items]
Spectrum revenues	$ 182	$ 182

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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