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Geographic and Product Data (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2016 | Jul. 03, 2015 | Jul. 01, 2016 | Jul. 03, 2015
Geographic And Sales [Line Items] |  |  |  |
Net sales | $ 20,974 | $ 18,657 | $ 40,243 | $ 37,514
Japan [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | 3,989 | 3,980 | 8,229 | 8,267
China [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | 4,417 | 3,327 | 7,495 | 5,698
United States [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | 2,420 | 2,723 | 4,936 | 5,589
Korea [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | 1,665 | 1,269 | 3,687 | 3,612
Spain [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | 1,528 | 1,486 | 2,980 | 2,964
France [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | 1,103 | 888 | 2,230 | 2,039
Germany [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | 1,153 | 694 | 2,120 | 1,190
Other [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | $ 4,699 | $ 4,290 | $ 8,566 | $ 8,155

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