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Revenue, Deferred Revenue And Prepaid Commissions - Additional Information and Disaggregation of Revenue (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
revenue_component
Sep. 30, 2020
USD ($)
Revenues from External Customers and Long-Lived Assets        
Total revenue $ 35,851 $ 37,693 $ 107,610 $ 110,699
Deferred revenue recognized from previous period     20,900  
United States        
Revenues from External Customers and Long-Lived Assets        
Total revenue 34,758 36,819 104,730 108,650
International        
Revenues from External Customers and Long-Lived Assets        
Total revenue 1,093 874 2,880 2,049
Wireless products and services        
Revenues from External Customers and Long-Lived Assets        
Total revenue 19,644 20,828 59,623 63,293
License        
Revenues from External Customers and Long-Lived Assets        
Total revenue 1,674 1,988 3,999 3,692
Services        
Revenues from External Customers and Long-Lived Assets        
Total revenue 4,159 4,772 13,378 13,132
Equipment        
Revenues from External Customers and Long-Lived Assets        
Total revenue 596 554 1,694 1,880
Subscription        
Revenues from External Customers and Long-Lived Assets        
Total revenue 133 24 $ 268 24
Maintenance        
Revenues from External Customers and Long-Lived Assets        
Typical duration of revenue recognition     Maintenance revenue is for ongoing support of our software solutions or related equipment and access to when-and-if available software updates.  
Total revenue $ 9,645 $ 9,527 $ 28,648 $ 28,678
Wireless products and services        
Revenues from External Customers and Long-Lived Assets        
Revenue primary component | revenue_component     2  
Software        
Revenues from External Customers and Long-Lived Assets        
Revenue primary component | revenue_component     2