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Revenue, Deferred Revenue and Prepaid Commissions - Schedule of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Revenues $ 142,153 $ 148,180 $ 160,289
United States      
Disaggregation of Revenue [Line Items]      
Revenues 138,265 145,349 154,766
International      
Disaggregation of Revenue [Line Items]      
Revenues 3,888 2,831 5,523
Wireless revenue      
Disaggregation of Revenue [Line Items]      
Revenues 78,826 83,593 88,167
Paging revenue      
Disaggregation of Revenue [Line Items]      
Revenues 75,845 79,916 85,067
Product and other revenue      
Disaggregation of Revenue [Line Items]      
Revenues 2,981 3,677 3,100
Software revenue      
Disaggregation of Revenue [Line Items]      
Revenues 63,327 64,587 72,122
Operations revenue      
Disaggregation of Revenue [Line Items]      
Revenues 25,345 25,996 31,757
License      
Disaggregation of Revenue [Line Items]      
Revenues 5,494 5,179 8,950
Professional services      
Disaggregation of Revenue [Line Items]      
Revenues 17,161 17,910 19,189
Hardware      
Disaggregation of Revenue [Line Items]      
Revenues 2,267 2,841 3,618
Subscription      
Disaggregation of Revenue [Line Items]      
Revenues 423 66 0
Maintenance      
Disaggregation of Revenue [Line Items]      
Revenues $ 37,982 $ 38,591 $ 40,365