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Segment Information and Foreign Operations - Product Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue by product type |  |  |  |
Revenue | $ 28,626 | $ 28,168 | $ 80,165 | $ 72,341
Substrates |  |  |  |
Revenue by product type |  |  |  |
Revenue | 22,802 | 22,377 | 63,769 | 58,095
Raw Materials And Others |  |  |  |
Revenue by product type |  |  |  |
Revenue | $ 5,824 | $ 5,791 | $ 16,396 | $ 14,246

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