Revenue, Deferred Revenue And Prepaid Commissions - Additional Information and Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) revenue_component	Jun. 30, 2021 USD ($)
Revenues from External Customers and Long-Lived Assets
Total revenue	$ 33,710	$ 35,723	$ 67,535	$ 71,759
Deferred revenue recognized from previous period			17,000
United States
Revenues from External Customers and Long-Lived Assets
Total revenue	32,553	34,799	65,325	69,973
International
Revenues from External Customers and Long-Lived Assets
Total revenue	1,157	924	$ 2,210	1,786
Wireless revenue
Revenues from External Customers and Long-Lived Assets
Revenue primary component | revenue_component			2
Total revenue	18,700	19,859	$ 37,547	39,979
Paging revenue
Revenues from External Customers and Long-Lived Assets
Total revenue	18,141	19,135	36,454	38,488
Product and other revenue
Revenues from External Customers and Long-Lived Assets
Total revenue	559	724	$ 1,093	1,491
Software revenue
Revenues from External Customers and Long-Lived Assets
Revenue primary component | revenue_component			2
Total revenue	15,010	15,864	$ 29,988	31,780
License
Revenues from External Customers and Long-Lived Assets
Total revenue	1,962	908	3,786	2,460
Professional services
Revenues from External Customers and Long-Lived Assets
Total revenue	3,331	4,865	6,667	9,219
Hardware
Revenues from External Customers and Long-Lived Assets
Total revenue	507	482	1,096	1,098
Operations revenue
Revenues from External Customers and Long-Lived Assets
Total revenue	5,800	6,255	11,549	12,777
Maintenance
Revenues from External Customers and Long-Lived Assets
Total revenue	$ 9,210	$ 9,609	$ 18,439	$ 19,003