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Geographic and Product Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Geographic And Sales [Line Items]
Net sales	$ 23,473	$ 20,052	$ 65,759	$ 60,295
Japan [Member]
Geographic And Sales [Line Items]
Net sales	4,633	4,029	12,849	12,258
China [Member]
Geographic And Sales [Line Items]
Net sales	7,164	4,254	17,489	11,749
United States [Member]
Geographic And Sales [Line Items]
Net sales	1,896	2,419	5,946	7,355
Other [Member]
Geographic And Sales [Line Items]
Net sales	$ 9,780	$ 9,350	$ 29,475	$ 28,933

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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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