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Geographic and Product Data (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jul. 04, 2014 | Jun. 28, 2013 | Jul. 04, 2014 | Jun. 28, 2013
Geographic and Product Data [Line Items] |  |  |  |
Net sales | $ 20,048 | $ 18,164 | $ 40,226 | $ 36,165
Japan [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 4,549 | 4,648 | 9,557 | 9,387
United States [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 2,926 | 3,154 | 5,801 | 6,394
China [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 2,535 | 2,230 | 4,759 | 4,301
Korea [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 1,952 | 1,834 | 4,573 | 3,869
Spain [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 1,474 | 1,163 | 3,092 | 2,454
France [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 1,190 | 595 | 2,136 | 1,127
Germany [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 1,015 | 611 | 1,912 | 1,126
Other [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | $ 4,407 | $ 3,929 | $ 8,396 | $ 7,507

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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