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Consolidated Financial Statements' Components - Property and Equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 98,061 $ 99,126
Accumulated depreciation (89,838) (92,380)
Total property and equipment, net $ 8,223 6,746
Minimum    
Property, Plant and Equipment [Line Items]    
Useful Life (In Years) 1 year  
Maximum    
Property, Plant and Equipment [Line Items]    
Useful Life (In Years) 5 years  
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 2,497 3,307
Asset retirement costs    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 3,848 2,307
Asset retirement costs | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Life (In Years) 1 year  
Asset retirement costs | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Life (In Years) 5 years  
Paging and computer equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 88,427 89,844
Paging and computer equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Life (In Years) 1 year  
Paging and computer equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Life (In Years) 5 years  
Furniture, fixtures and vehicles    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 3,289 $ 3,668
Furniture, fixtures and vehicles | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Life (In Years) 3 years  
Furniture, fixtures and vehicles | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Life (In Years) 5 years