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Segment Information and Foreign Operations - Product Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenue by product type |  |  |  |
Revenue | $ 23,557 | $ 20,495 | $ 44,173 | $ 39,208
Substrates |  |  |  |
Revenue by product type |  |  |  |
Revenue | 19,109 | 16,727 | 35,718 | 32,579
Raw Materials And Others |  |  |  |
Revenue by product type |  |  |  |
Revenue | $ 4,448 | $ 3,768 | $ 8,455 | $ 6,629

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- Definition 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 + Details
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