Segment, Concentration and Geographical Information - Wireless Revenues by Product Line (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenue from External Customer [Line Items]
Total revenues	$ 48,513	$ 58,422
Wireless
Revenue from External Customer [Line Items]
Total revenues	48,513	58,422
Wireless | Family Safety
Revenue from External Customer [Line Items]
Total revenues	39,798	41,019
Wireless | CommSuite
Revenue from External Customer [Line Items]
Total revenues	4,846	13,717
Wireless | ViewSpot
Revenue from External Customer [Line Items]
Total revenues	3,869	3,569
Wireless | Other
Revenue from External Customer [Line Items]
Total revenues	$ 0	$ 117