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Disaggregation of Revenues, Geographic Sales and Product Sales (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 30, 2018 | Mar. 31, 2017
Revenue, Net, Total |  | $ 27,093 | $ 20,350
Royalty income | [1] | 157 | 131
Total revenues |  | 27,250 | 20,481
Non Consignment Sales [Member] |  |  |
Revenue, Net, Total |  | 22,181 | 15,756
Consignment Sales [Member] |  |  |
Revenue, Net, Total |  | $ 4,912 | $ 4,594
[1] | Shown as a separate line item in other income, net on the Condensed Consolidated Statements of Operations.

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- Definition Ancillary revenue earned during the period from the consideration paid to the entity for the use of its rights and property by another party. Examples include licensing the use of copyrighted materials and leasing the extraction of natural resources. + 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 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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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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