Revenue, Deferred Revenue And Prepaid Commissions - Additional Information and Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) revenue_component	Sep. 30, 2021 USD ($)
Revenues from External Customers and Long-Lived Assets
Total revenue	$ 33,744	$ 35,851	$ 101,279	$ 107,610
Deferred revenue recognized from previous period			20,800
United States
Revenues from External Customers and Long-Lived Assets
Total revenue	32,827	34,758	98,152	104,730
International
Revenues from External Customers and Long-Lived Assets
Total revenue	917	1,093	$ 3,127	2,880
Wireless revenue
Revenues from External Customers and Long-Lived Assets
Revenue primary component | revenue_component			2
Total revenue	19,054	19,644	$ 56,601	59,623
Paging revenue
Revenues from External Customers and Long-Lived Assets
Total revenue	18,419	18,844	54,873	57,332
Product and other revenue
Revenues from External Customers and Long-Lived Assets
Total revenue	635	800	$ 1,728	2,291
Software revenue
Revenues from External Customers and Long-Lived Assets
Revenue primary component | revenue_component			2
Total revenue	14,690	16,207	$ 44,678	47,987
License
Revenues from External Customers and Long-Lived Assets
Total revenue	2,147	1,807	5,933	4,267
Professional services
Revenues from External Customers and Long-Lived Assets
Total revenue	2,835	4,159	9,502	13,378
Hardware
Revenues from External Customers and Long-Lived Assets
Total revenue	530	596	1,626	1,694
Operations revenue
Revenues from External Customers and Long-Lived Assets
Total revenue	5,512	6,562	17,061	19,339
Maintenance
Revenues from External Customers and Long-Lived Assets
Total revenue	$ 9,178	$ 9,645	$ 27,617	$ 28,648