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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues $ 101,376 $ 113,876 $ 205,469 $ 236,895
Standard products business [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues 91,288 103,268 185,298 216,174
Standard products business [Member] | Korea [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues 31,168 30,868 62,198 57,302
Standard products business [Member] | Asia Pacific (Other Than Korea) [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues 56,068 69,352 114,328 153,092
Standard products business [Member] | United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues 2,492 1,363 5,356 2,637
Standard products business [Member] | Europe [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues 1,560 1,206 3,416 2,449
Standard products business [Member] | Others [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenues $ 0 $ 479 $ 0 $ 694