Segment Information and Foreign Operations - Product Information (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Revenue by product type
Revenue	$ 19,356	$ 22,688
Substrates
Revenue by product type
Revenue	11,082	16,903
Raw materials and others
Revenue by product type
Revenue	$ 8,274	$ 5,785

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details