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Disaggregation of Revenues, Geographic Sales and Product Sales (Details 1) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 30, 2018 | Mar. 31, 2017
Geographic And Sales [Line Items] |  |  |
Net sales |  | $ 27,093 | $ 20,350
Japan [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Net sales |  | 5,083 | 3,799
China [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Net sales |  | 7,910 | 4,626
United States [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Net sales |  | 1,756 | 1,958
Korea [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Net sales |  | 2,195 | 1,426
Other [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Net sales | [1] | $ 10,149 | $ 8,541
[1] | No other location individually exceeds 10% of the total sales.

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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=63488584&loc=d3e20235-122688 + Details
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