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Segment Information and Foreign Operations - Product Information (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Revenue by product type |  |
Revenue | $ 20,208 | $ 24,419
Substrates |  |
Revenue by product type |  |
Revenue | 16,766 | 19,364
Raw Materials And Others |  |
Revenue by product type |  |
Revenue | $ 3,442 | $ 5,055

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