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Geographic and Product Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 30, 2016	Oct. 02, 2015
Geographic And Sales [Line Items]
Net sales	$ 20,052	$ 18,750	$ 60,295	$ 56,264
Japan [Member]
Geographic And Sales [Line Items]
Net sales	4,029	4,249	12,258	12,514
China [Member]
Geographic And Sales [Line Items]
Net sales	4,254	3,095	11,749	8,794
United States [Member]
Geographic And Sales [Line Items]
Net sales	2,419	2,873	7,355	8,464
Other [Member]
Geographic And Sales [Line Items]
Net sales	$ 9,350	$ 8,533	$ 28,933	$ 26,492

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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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