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

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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