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Segment Information and Foreign Operations - Product Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenue by product type        
Revenue $ 35,183 $ 34,576 $ 114,323 $ 99,661
Substrates        
Revenue by product type        
Revenue 26,861 26,155 90,300 74,433
Raw Materials And Others        
Revenue by product type        
Revenue $ 8,322 $ 8,421 $ 24,023 $ 25,228