Business Segments, Geographic Data, and Sales by Major Customers - Information by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 44,623		$ 44,623		$ 47,340
Net sales	78,758	$ 95,182	145,315	$ 166,008
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	26,709		26,709		31,175
Net sales	66,777	82,409	118,695	139,967
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	13,869		13,869		11,461
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	2,428		2,428		2,937
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	1,423		1,423		1,633
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	5,761	6,546	13,379	13,737
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	109		109		134
Net sales	2,684	2,182	5,032	4,742
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	85		85		$ 0
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,462	1,876	3,232	3,467
Australia & New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	802	782	2,333	1,688
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,082	1,071	2,082	1,936
Middle East & Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 190	$ 316	$ 562	$ 471