Product Line and Geographic Information - Result of Product Line Revenues and Gross Profits (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Results of operations by segments
Revenues	$ 25,988	$ 22,411	$ 73,506	$ 61,799
Gross Profit	$ 11,936	$ 10,254	$ 32,696	$ 28,533
Gross Profit %	45.90%	45.80%	44.50%	46.20%
Operating Segments [Member] | Antennas & Industrial IoT Devices [Member]
Results of operations by segments
Revenues	$ 18,653	$ 16,686	$ 53,310	$ 43,971
Gross Profit	$ 6,562	$ 5,655	$ 17,435	$ 14,578
Gross Profit %	35.20%	33.90%	32.70%	33.20%
Operating Segments [Member] | Test & Measurement Products [Member]
Results of operations by segments
Revenues	$ 7,683	$ 5,921	$ 20,698	$ 18,540
Gross Profit	$ 5,544	$ 4,635	$ 15,466	$ 14,057
Gross Profit %	72.20%	78.30%	74.70%	75.80%
Corporate, Non-Segment [Member]
Results of operations by segments
Revenues	$ (348)	$ (196)	$ (502)	$ (712)
Gross Profit	$ (170)	$ (36)	$ (205)	$ (102)