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Geographic and Product Data (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2017 | Sep. 30, 2016 | Sep. 29, 2017 | Sep. 30, 2016
Geographic And Sales [Line Items] |  |  |  |
Net sales | $ 23,473 | $ 20,052 | $ 65,759 | $ 60,295
Japan [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | 4,633 | 4,029 | 12,849 | 12,258
China [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | 7,164 | 4,254 | 17,489 | 11,749
United States [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | 1,896 | 2,419 | 5,946 | 7,355
Other [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | $ 9,780 | $ 9,350 | $ 29,475 | $ 28,933

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