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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended |  |  |
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Mar. 31, 2022 USD ($) item $ / shares shares | Mar. 31, 2021 USD ($) item shares | Mar. 31, 2020 USD ($) shares | Sep. 30, 2021 | Dec. 31, 2020 | Apr. 30, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of carriers | 2 |  | 2 |  |  |
Accounts receivable | $ 0 | $ 4,000 |  |  |  |
Liabilities settled | $ 109,000 | 226,000 |  |  |  |
Wireless licenses term | 10 years |  |  |  |  |
Impairment charges | $ 0 | 0 | $ 0 |  |  |
Impairment of long-lived assets | 0 | 85,000 | $ 46,000 |  |  |
Property and equipment, net | 2,949,000 | $ 3,574,000 |  |  |  |
Lease extension |  |  |  | 10 years | 10 years |
Lease term |  |  |  |  | 30 years |
Tax benefits attributed to share-based compensation expense | $ 0 |  |  |  |  |
Potentially dilutive securities outstanding but excluded from computation of earnings per share | shares | 1,343,000 | 1,382,000 | 1,440,000 |  |  |
Property, Plant and Equipment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impairment of long-lived assets |  |  | $ 35,000 |  |  |
Property and equipment, net |  | $ 0 |  |  |  |
Right Of Use Asset |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impairment of long-lived assets |  |  | 11,000 |  |  |
Property and equipment, net |  |  | 0 |  |  |
Minimum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Lease extension | 3 years |  |  |  |  |
Lease term |  |  |  | 40 years | 40 years |
Accelerated vesting provision, change in control, purchase price (in dollars per share) | $ / shares | $ 100 |  |  |  |  |
Maximum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Lease extension | 10 years |  |  |  |  |
Lease term |  |  |  | 40 years | 40 years |
Advertising |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Advertising and promotional expense | $ 89,000 | $ 19,000 | $ 33,000 |  |  |
Tier 1 Carrier Partner |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of carriers | 1 | 1 |  |  |  |
Customer Concentration Risk | Sales Revenue, Services, Net | Reseller |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of resellers |  | 1 | 1 |  |  |
Customer Concentration Risk | Sales Revenue, Services, Net | Domestic Carrier And Reseller |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration risk, percentage |  | 17.00% | 21.00% |  |  |
Customer Concentration Risk | Accounts Receivable |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Accounts receivable | $ 0 |  |  |  |  |
Customer Concentration Risk | Accounts Receivable | Tier 1 Carrier Partner |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of carriers | item |  | 1 |  |  |  |
TeamConnect LLC |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 19.50%
Leased Premises |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Liabilities settled | $ 100,000 | $ 200,000 |  |  |  |
Revision of estimate |  | $ 100,000 |  |  |  |

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