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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 |

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