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Acquisitions - Summary of Preliminary Allocation of Purchase Price (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Apr. 16, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 39,591 |  | $ 12,266
Avast PLC Family Safety Mobile Software Business [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  | $ 6,351 |
Accounts receivable |  | 6,225 |
Prepaid expenses |  | 513 |
Fixed assets |  | 1,218 |
Intangible assets |  | 33,500 |
Goodwill |  | 27,325 |
Total assets |  | 75,132 |
Accounts payable |  | 392 |
Accrued payroll and benefits |  | 1,693 |
Accrued expenses |  | 314 |
Total liabilities |  | 2,399 |
Total purchase price |  | $ 72,733 |

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