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Consolidated Financial Statements' Components - Depreciation, Amortization and Accretion (Details) - USD ($)
 12 Months Ended
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