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Segment, Customer Concentration and Geographical Information - Wireless Revenues by Product (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Revenue from External Customer [Line Items] |  |  |  |
Total revenues | $ 12,674 | $ 15,919 | $ 25,409 | $ 27,300
Wireless |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues | 12,674 | 15,919 | 25,409 | 27,300
Wireless | Family Safety |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues | 10,161 | 11,119 | 20,528 | 17,385
Wireless | CommSuite |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues | 1,433 | 3,944 | 2,862 | 8,073
Wireless | ViewSpot |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues | 1,080 | 817 | 2,014 | 1,746
Wireless | Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues | $ 0 | $ 39 | $ 5 | $ 96

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