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The Company and Summary of Significant Accounting Policies - Concentration Risk (Details)	12 Months Ended
	Dec. 31, 2017 customer item	Dec. 31, 2016 customer item	Dec. 31, 2015 customer item
Revenue
Revenue, Major Customer [Line Items]
Number of customers representing significant share	2	0	1
Accounts Receivable
Revenue, Major Customer [Line Items]
Number of customers representing significant share	1	1
Raw Materials | Revenue
Revenue, Major Customer [Line Items]
Number of customers representing significant share | item	3	4	3
Major Customer One | Revenue
Revenue, Major Customer [Line Items]
Percentage share generated by major customers (in hundredths)	12.00%		12.00%
Major Customer One | Accounts Receivable
Revenue, Major Customer [Line Items]
Percentage share generated by major customers (in hundredths)	12.00%	13.00%
Major Customer Two | Revenue
Revenue, Major Customer [Line Items]
Percentage share generated by major customers (in hundredths)	11.00%
Top Five Major Customers | Revenue
Revenue, Major Customer [Line Items]
Number of customers representing significant share	5	5	5
Percentage share generated by major customers (in hundredths)	35.00%	35.00%	40.00%

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- Definition

Number of customers who represented significant share in the entity during the reporting period.

+ References

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- Definition

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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