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Schedule of Geographic Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2018 | Sep. 29, 2017 | Sep. 28, 2018 | Sep. 29, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 160,794 | $ 146,296 | $ 458,159 | $ 374,372
UNITED STATES |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 63,073 | 58,949 | 181,653 | 157,778
GERMANY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 23,089 | 17,728 | 64,170 | 46,807
Rest Of Europe |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 30,222 | 27,152 | 80,629 | 55,164
CHINA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 17,516 | 15,459 | 51,486 | 40,920
Rest of Asia-Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 24,882 | 23,769 | 74,589 | 64,511
Other Countries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 2,012 | $ 3,239 | $ 5,632 | $ 9,192

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