Product Line and Geographic Information - Result of Product Line Revenues and Gross Profits (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Results of operations by segments
Revenues	$ 22,973	$ 22,542
Gross Profit	$ 11,532	$ 9,333
Gross Profit %	50.20%	41.40%
Operating Segments [Member] | Antennas & Industrial IoT Devices [Member]
Results of operations by segments
Revenues	$ 15,614	$ 17,102
Gross Profit	$ 6,120	$ 5,247
Gross Profit %	39.20%	30.70%
Operating Segments [Member] | Test & Measurement Products [Member]
Results of operations by segments
Revenues	$ 7,427	$ 5,583
Gross Profit	$ 5,383	$ 4,162
Gross Profit %	72.50%	74.50%
Corporate, Non-Segment [Member]
Results of operations by segments
Revenues	$ (68)	$ (143)
Gross Profit	$ 29	$ (76)