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The Company and Summary of Significant Accounting Policies - Concentration Risk (Details) - customer | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenue [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Number of customers representing significant share | 0 | 1 | 0
Percentage share generated by major customers (in hundredths) | 10.00% |  | 10.00%
Accounts Receivable [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Number of customers representing significant share | 1 | 1 |
Major Customer One [Member] | Accounts Receivable [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage share generated by major customers (in hundredths) | 13.00% | 22.00% |
IQE Group Customer [Member] | Revenue [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage share generated by major customers (in hundredths) |  | 12.00% |
Top Five Major Customers [Member] | Revenue [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Number of customers representing significant share | 5 | 5 | 5
Percentage share generated by major customers (in hundredths) | 35.00% | 40.00% | 34.00%

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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 + Details
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