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The Company and Summary of Significant Accounting Policies - The Company (Details)	12 Months Ended
	Dec. 31, 2017 segment item
Product Information [Line Items]
Number of operating segments | segment	1
Number of product lines | segment	2
Minimum
Product Information [Line Items]
Temperature in C | item	500
Maximum
Product Information [Line Items]
Temperature in C | item	1,500
Sales Revenue, Net | Specialty Material Substrates
Product Information [Line Items]
Revenue by product line (as a percent)	80.00%
Sales Revenue, Net | Raw Materials
Product Information [Line Items]
Revenue by product line (as a percent)	20.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

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-Name Accounting Standards Codification
-Topic 275
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-SubTopic 10
-Section 50
-Paragraph 21
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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