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Geographic and Other Information - Net Sales by Region, Based on Location of Products are Billed (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues $ 45,946 $ 55,434 $ 138,290 $ 145,272
Standard products business [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues 45,946 52,994 138,290 136,970
Standard products business [Member] | Korea [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues 23,269 22,893 67,706 59,867
Standard products business [Member] | Asia Pacific (Other Than Korea) [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues 20,308 28,189 63,745 71,879
Standard products business [Member] | United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues 1,137 667 3,789 1,313
Standard products business [Member] | Europe [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues $ 1,232 $ 1,245 $ 3,050 $ 3,911