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Disaggregation of Revenues, Geographic Sales and Product Sales (Details 1) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Geographic And Sales [Line Items]
Revenues		$ 31,770	$ 23,473	$ 92,768	$ 65,759
Geographic Distribution, Domestic [Member]
Geographic And Sales [Line Items]
Revenues		1,676	1,896	5,327	5,946
Geographic Distribution, Foreign [Member]
Geographic And Sales [Line Items]
Revenues		30,094	21,577	87,441	59,813
China [Member]
Geographic And Sales [Line Items]
Revenues		13,349	7,397	35,224	18,069
Japan [Member]
Geographic And Sales [Line Items]
Revenues		6,006	4,633	17,781	12,849
Other [Member]
Geographic And Sales [Line Items]
Revenues	[1]	$ 12,415	$ 11,443	$ 39,763	$ 34,841
[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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