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Organization and Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
account
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Property, Plant and Equipment [Line Items]      
Commissions expense $ 4,000,000 $ 4,400,000 $ 4,300,000
Goodwill and capitalized software development impairment 0 0 25,000,000
Impairment of intangible assets $ 0 0 0
Capitalized computer software, impairments   15,700,000  
Number of significant allowance accounts | account 2    
Contractor fee, annual percentage increase 3.10%    
Valuation allowance, deferred tax asset, increase (decrease), amount $ (21,900,000)    
Valuation allowance 2,328,000 24,178,000  
Uncertain tax positions 0 0  
Advertising expenses 1,000,000 1,400,000 1,300,000
Provisions for doubtful accounts, service credits and other $ 1,200,000 $ 700,000 $ 1,100,000
Capitalized software development costs      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 1 year    
Minimum | Paging Equipment Assets      
Property, Plant and Equipment [Line Items]      
Useful life 1 year    
Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Maximum | Paging Equipment Assets      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Customer Relationships      
Property, Plant and Equipment [Line Items]      
Amortization of intangible assets 10 years 10 years