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Acquisitions - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 16, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |  |
Revenues |  |  | $ 15,919,000 | $ 12,933,000 | $ 27,300,000 | $ 26,255,000
Cost of revenues |  |  | 3,358,000 | $ 1,269,000 | 4,903,000 | $ 2,441,000
Avast PLC Family Safety Mobile Software Business [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date of acquisition agreement | Apr. 16, 2021 |  |  |  |  |
Goodwill expected tax deductible amount | $ 0 |  |  |  |  |
Revenues |  | $ 6,000,000.0 |  |  |  |
Cost of revenues |  | 1,700,000 |  |  |  |
Avast PLC Family Safety Mobile Software Business [Member] | Other Accrued Liabilities [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration |  | $ 1,100,000 | $ 1,100,000 |  | $ 1,100,000 |
Avast PLC Family Safety Mobile Software Business [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Earn-out provision for additional future payments | $ 14,000,000.0 |  |  |  |  |

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