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Revenue, Deferred Revenue and Prepaid Commissions - Schedule of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Revenues $ 134,534 $ 142,153 $ 148,180
United States      
Disaggregation of Revenue [Line Items]      
Revenues 130,380 138,265 145,349
International      
Disaggregation of Revenue [Line Items]      
Revenues 4,154 3,888 2,831
Wireless revenue      
Disaggregation of Revenue [Line Items]      
Revenues 75,622 78,826 83,593
Paging revenue      
Disaggregation of Revenue [Line Items]      
Revenues 73,323 75,845 79,916
Product and other revenue      
Disaggregation of Revenue [Line Items]      
Revenues 2,299 2,981 3,677
Software revenue      
Disaggregation of Revenue [Line Items]      
Revenues 58,912 63,327 64,587
Operations revenue      
Disaggregation of Revenue [Line Items]      
Revenues 21,978 25,345 25,996
License      
Disaggregation of Revenue [Line Items]      
Revenues 7,202 5,917 5,245
Professional services      
Disaggregation of Revenue [Line Items]      
Revenues 12,565 17,161 17,910
Hardware      
Disaggregation of Revenue [Line Items]      
Revenues 2,211 2,267 2,841
Maintenance      
Disaggregation of Revenue [Line Items]      
Revenues $ 36,934 $ 37,982 $ 38,591