Segment, Customer Concentration and Geographical Information - Wireless Revenues by Product (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue from External Customer [Line Items]
Total revenues	$ 10,930	$ 12,735
Wireless
Revenue from External Customer [Line Items]
Total revenues	10,930	12,735
Wireless | Family Safety
Revenue from External Customer [Line Items]
Total revenues	9,089	10,366
Wireless | CommSuite
Revenue from External Customer [Line Items]
Total revenues	826	1,430
Wireless | ViewSpot
Revenue from External Customer [Line Items]
Total revenues	$ 1,015	$ 939