Business Segments, Geographic Data, and Sales by Major Customers - Information by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	$ 15,399		$ 15,259
Net sales	66,557	$ 70,826
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	11,846		11,461
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	3,329		3,556
Net sales	51,918	57,558
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	224		$ 242
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	7,618	7,191
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	2,348	2,560
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,770	1,591
Australia & New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,531	906
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,000	865
Middle East & Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 372	$ 155