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Acquisitions - Summary of Unaudited Proforma Results of Operation (Detail) - Avast PLC Family Safety Mobile Software Business [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 16,443 | $ 21,781 | $ 52,975 | $ 66,340
Net (loss) income | $ (5,493) | $ (684) | $ (13,648) | $ 551
(Loss) earnings per share: |  |  |  |
Basic | $ (0.10) | $ (0.01) | $ (0.26) | $ 0.01
Diluted | $ (0.10) | $ (0.01) | $ (0.26) | $ 0.01

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