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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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