Segment, Concentration and Geographical Information - Wireless Revenues by Product Line (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Total revenues	$ 40,862	$ 48,513
Wireless
Revenue from External Customer [Line Items]
Total revenues	40,862	48,513
Wireless | Family Safety
Revenue from External Customer [Line Items]
Total revenues	34,513	39,798
Wireless | CommSuite
Revenue from External Customer [Line Items]
Total revenues	2,834	4,846
Wireless | ViewSpot
Revenue from External Customer [Line Items]
Total revenues	$ 3,515	$ 3,869