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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

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