Segment Information and Foreign Operations - Product Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue by product type
Revenue	$ 39,487	$ 33,735	$ 79,140	$ 65,085
Substrates
Revenue by product type
Revenue	31,694	24,905	63,439	48,278
Raw Materials And Others
Revenue by product type
Revenue	$ 7,793	$ 8,830	$ 15,701	$ 16,807

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