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Geographic and Product Data (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Oct. 03, 2014 | Sep. 27, 2013 | Oct. 03, 2014 | Sep. 27, 2013
Geographic and Product Data [Line Items] |  |  |  |
Net sales | $ 18,188 | $ 17,106 | $ 58,414 | $ 53,271
Japan [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 4,792 | 4,040 | 14,349 | 13,427
United States [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 2,875 | 2,993 | 8,676 | 9,388
China [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 2,915 | 2,275 | 7,675 | 6,575
Korea [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 1,098 | 1,982 | 5,671 | 5,851
Spain [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 1,178 | 1,012 | 4,270 | 3,466
France [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | 820 | 595 | 2,956 | 1,722
Other [Member] |  |  |  |
Geographic and Product Data [Line Items] |  |  |  |
Net sales | $ 4,510 | $ 4,209 | $ 14,817 | $ 12,842

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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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