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Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($) shares	Mar. 31, 2021 USD ($) item
Summary Of Significant Accounting Policies [Line Items]
Equity based compensation		$ 8,600,000	$ 6,516,000	$ 10,573,000
Impairment of long-lived assets	$ 112,000	0	127,000	$ 29,000
Property and equipment, net	3,049,000		$ 3,049,000		$ 3,574,000
Potentially dilutive securities outstanding but excluded from computation of earnings per share | shares			1,454,000	1,540,000
Selling, General and Administrative Expenses [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity based compensation		8,400,000		$ 10,200,000
Research and Development Expense [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity based compensation		200,000		300,000
Sales And Support [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity based compensation		62,000		100,000
Property, Plant and Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of long-lived assets	100,000		$ 100,000	29,000
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Wireless licenses term			10 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Wireless licenses term			15 years
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Tier 1 Carrier Partner [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of carriers | item					1
Network Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of long-lived assets	100,000		$ 100,000
Property and equipment, net	$ 0		$ 0
Network Sites [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of long-lived assets				29,000
Property and equipment, net		$ 0		$ 0

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