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Segment Information and Foreign Operations - Product Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue by product type
Revenue	$ 26,332	$ 28,168	$ 23,557	$ 20,616	$ 20,269	$ 21,872	$ 20,495	$ 18,713	$ 98,673	$ 81,349	$ 77,502
Substrates
Revenue by product type
Revenue									78,619	65,633	58,220
Raw Materials And Others
Revenue by product type
Revenue									$ 20,054	$ 15,716	$ 19,282

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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