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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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