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The Company and Summary of Significant Accounting Policies - Risks and Concentration of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2018 customer item	Dec. 31, 2017 customer item	Dec. 31, 2016 customer item
Revenues
The Company and Summary of Significant Accounting Policies
Number of customers representing significant share		2	0
Accounts Receivable [Member]
The Company and Summary of Significant Accounting Policies
Number of customers representing significant share	3	1
Raw Materials | Revenues
The Company and Summary of Significant Accounting Policies
Number of customers representing significant share | item	3	3	4
Landmark | Revenues
The Company and Summary of Significant Accounting Policies
Number of customers representing significant share	1
Percentage share generated by major customers (in hundredths)	13.00%
Major Customer One | Revenues
The Company and Summary of Significant Accounting Policies
Percentage share generated by major customers (in hundredths)		12.00%
Major Customer One | Accounts Receivable [Member]
The Company and Summary of Significant Accounting Policies
Percentage share generated by major customers (in hundredths)	17.00%	12.00%
Major Customer Two | Revenues
The Company and Summary of Significant Accounting Policies
Percentage share generated by major customers (in hundredths)		11.00%
Major Customer Two | Accounts Receivable [Member]
The Company and Summary of Significant Accounting Policies
Percentage share generated by major customers (in hundredths)	12.00%
Major Customer Three | Accounts Receivable [Member]
The Company and Summary of Significant Accounting Policies
Percentage share generated by major customers (in hundredths)	10.00%
Top Five Major Customers | Revenues
The Company and Summary of Significant Accounting Policies
Number of customers representing significant share	5	5	5
Percentage share generated by major customers (in hundredths)	35.00%	35.00%	35.00%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
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