Geographic and Other Information - Net Sales by Region, Based on Location of Products are Billed (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 44,722	$ 43,438
Standard products business [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	44,722	$ 39,912	$ 39,912
Standard products business [Member] | Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	21,716		17,091
Standard products business [Member] | Asia Pacific (Other Than Korea) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	20,992		21,089
Standard products business [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	1,182		338
Standard products business [Member] | Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 832		$ 1,394