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Segment Information and Foreign Operations - Product Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue by product type |  |  |  |
Revenue | $ 19,841 | $ 28,626 | $ 64,846 | $ 80,165
Substrates |  |  |  |
Revenue by product type |  |  |  |
Revenue | 15,959 | 22,802 | 53,324 | 63,769
Raw Materials And Others |  |  |  |
Revenue by product type |  |  |  |
Revenue | $ 3,882 | $ 5,824 | $ 11,522 | $ 16,396

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