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Disaggregation of Revenues, Geographic Sales and Product Sales (Details) - USD ($) $ in Thousands		3 Months Ended
		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

The amount of revenues including royalty income non operating.

+ References

No definition available.

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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

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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

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