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
|