Segment Information and Foreign Operations - Product Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue by product type
Revenue	$ 75,795	$ 141,118	$ 137,393
Substrates
Revenue by product type
Revenue	47,466	111,094	103,026
Raw materials and others
Revenue by product type
Revenue	$ 28,329	$ 30,024	$ 34,367