Geographic and Other Information - Net Sales by Region, Based on Location of Products are Billed (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 474,230	$ 507,059	$ 520,671
Standard products business [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	433,099	465,519	484,847
Standard products business [Member] | Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	113,776	106,415	132,622
Standard products business [Member] | Asia Pacific (Other Than Korea) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	306,333	347,597	343,652
Standard products business [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	6,052	5,147	2,399
Standard products business [Member] | Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	5,698	4,317	4,801
Standard products business [Member] | Others [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 1,240	$ 2,043	$ 1,373