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Segment, Geographic, Product and Significant Customer Information - Revenue Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Net revenues: |  |  |  |
Total net revenues | $ 88,604 | $ 64,427 | $ 170,917 | $ 123,741
South Korea [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues | 30,980 | 31,500 | 68,798 | 50,119
Japan [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues | 15,017 | 9,267 | 28,396 | 12,620
United States [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues | 7,392 | 8,297 | 14,130 | 21,870
China [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues | 28,333 | 7,330 | 36,375 | 14,017
Taiwan [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues | 1,974 | 4,878 | 3,034 | 16,711
Singapore [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues | 2,380 | 963 | 14,535 | 2,454
Other [Member] |  |  |  |
Net revenues: |  |  |  |
Total net revenues | $ 2,528 | $ 2,192 | $ 5,649 | $ 5,950

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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