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Segment, Geographic, Product and Significant Customer Information - Revenue Net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 30, 2017 | Dec. 31, 2016 | Dec. 26, 2015
Net revenues: |  |  |
Total net revenues | $ 258,621 | $ 221,129 | $ 187,367
South Korea [Member] |  |  |
Net revenues: |  |  |
Total net revenues | 94,082 | 44,735 | 30,572
China [Member] |  |  |
Net revenues: |  |  |
Total net revenues | 29,826 | 43,460 | 17,373
Singapore [Member] |  |  |
Net revenues: |  |  |
Total net revenues | 21,810 | 37,096 | 17,395
United States [Member] |  |  |
Net revenues: |  |  |
Total net revenues | 33,983 | 29,887 | 36,720
Taiwan [Member] |  |  |
Net revenues: |  |  |
Total net revenues | 20,147 | 27,189 | 46,715
Japan [Member] |  |  |
Net revenues: |  |  |
Total net revenues | 41,979 | 26,604 | 31,140
Other [Member] |  |  |
Net revenues: |  |  |
Total net revenues | $ 16,794 | $ 12,158 | $ 7,452

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