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Disaggregation of Revenues, Geographic Sales and Product Sales (Details 1) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Geographic And Sales [Line Items]
Net sales		$ 33,905	$ 21,936	$ 60,998	$ 42,286
Geographic Distribution, Domestic [Member]
Geographic And Sales [Line Items]
Net sales		1,895	2,092	3,651	4,050
Geographic Distribution, Foreign [Member]
Geographic And Sales [Line Items]
Net sales		32,010	19,844	57,347	38,236
Japan [Member]
Geographic And Sales [Line Items]
Net sales		6,692	4,417	11,775	8,216
China [Member]
Geographic And Sales [Line Items]
Net sales		13,965	6,046	21,875	10,672
Other [Member]
Geographic And Sales [Line Items]
Net sales	[1]	$ 13,248	$ 11,473	$ 27,348	$ 23,398
[1] No other location individually exceeds 10% of the total sales.

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- References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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