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Geographic and Product Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Geographic And Sales [Line Items]
Net sales	$ 21,936	$ 20,974	$ 42,286	$ 40,243
Japan [Member]
Geographic And Sales [Line Items]
Net sales	4,417	3,989	8,216	8,229
China [Member]
Geographic And Sales [Line Items]
Net sales	5,862	4,417	10,325	7,495
United States [Member]
Geographic And Sales [Line Items]
Net sales	2,092	2,420	4,050	4,936
Other [Member]
Geographic And Sales [Line Items]
Net sales	$ 9,565	$ 10,148	$ 19,695	$ 19,583

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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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