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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