Geographic and Other Information - Net Sales by Region, Based on Location of Products are Billed (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 230,051	$ 337,658	$ 474,230
Standard products business [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	195,690	301,896	433,099
Standard products business [Member] | Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	66,817	105,285	113,776
Standard products business [Member] | Asia Pacific (Other Than Korea) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	119,244	179,555	306,333
Standard products business [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	2,830	10,369	6,052
Standard products business [Member] | Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	6,799	6,687	5,698
Standard products business [Member] | Others [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 0	$ 0	$ 1,240