Segment, Customer Concentration and Geographical Information - Wireless Revenues by Product (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue from External Customer [Line Items]
Total revenues	$ 10,338	$ 12,674	$ 21,268	$ 25,409
Wireless
Revenue from External Customer [Line Items]
Total revenues	10,338	12,674	21,268	25,409
Wireless | Family Safety
Revenue from External Customer [Line Items]
Total revenues	8,748	10,161	17,838	20,528
Wireless | CommSuite
Revenue from External Customer [Line Items]
Total revenues	735	1,433	1,560	2,862
Wireless | ViewSpot
Revenue from External Customer [Line Items]
Total revenues	$ 855	$ 1,080	$ 1,870	$ 2,014