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Consolidated Financial Statements' Components - Depreciation, Amortization and Accretion (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |  |
Total depreciation | $ 2,891,000 | $ 4,056,000 | $ 5,012,000
Amortization |  |  |
Intangible assets | 0 | 417,000 | 2,500,000
Capitalized software development costs | 0 | 5,357,000 | 1,073,000
Total amortization | 0 | 5,774,000 | 3,573,000
Accretion | 680,000 | 616,000 | 471,000
Total depreciation, amortization and accretion expense | 3,571,000 | 10,446,000 | 9,056,000
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | 64,000 | 88,000 | 57,000
Asset retirement costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset retirement costs | (702,000) | (87,000) | (643,000)
Paging and computer equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | 3,289,000 | 3,797,000 | 5,291,000
Furniture, fixtures and vehicles |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | $ 240,000 | $ 258,000 | $ 307,000

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