Segment, Customer Concentration and Geographical Information - Wireless Revenues by Product (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue from External Customer [Line Items]
Total revenues	$ 5,798	$ 10,930
Wireless
Revenue from External Customer [Line Items]
Total revenues	5,798	10,930
Wireless | Family Safety
Revenue from External Customer [Line Items]
Total revenues	4,464	9,089
Wireless | CommSuite
Revenue from External Customer [Line Items]
Total revenues	665	826
Wireless | ViewSpot
Revenue from External Customer [Line Items]
Total revenues	$ 669	$ 1,015