Acquisitions - Additional Information (Details) - USD ($)		3 Months Ended		6 Months Ended	9 Months Ended
	Apr. 16, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Revenues		$ 16,443,000	$ 12,629,000		$ 43,743,000	$ 38,883,000
Cost of revenues		3,692,000	$ 1,326,000		8,595,000	$ 3,767,000
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				$ 13,000,000.0
Cost of revenues				3,800,000
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
Avast PLC Family Safety Mobile Software Business [Member] | Other Accrued Liabilities [Member]
Business Acquisition [Line Items]
Contingent consideration		13,700,000		13,700,000	13,700,000
Avast PLC Family Safety Mobile Software Business [Member] | Operating Expense [Member]
Business Acquisition [Line Items]
Earn-out provision for additional future payments		$ 12,900,000		$ 12,900,000	$ 12,900,000
Avast PLC Family Safety Mobile Software Business [Member] | Purchase Price Allocation [Member]
Business Acquisition [Line Items]
Earn-out provision for additional future payments	$ 1,100,000