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Disaggregation of Sales, Geographic Sales and Product Sales - Net Sales by Geographic Areas (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Geographic And Sales [Line Items]
Total net sales		$ 39,055	$ 31,770	$ 111,302	$ 92,768
Geographic Distribution, Domestic [Member]
Geographic And Sales [Line Items]
Total net sales		1,783	1,676	5,849	5,327
Geographic Distribution, Foreign [Member]
Geographic And Sales [Line Items]
Total net sales		37,272	30,094	105,453	87,441
China [Member]
Geographic And Sales [Line Items]
Total net sales		18,361	13,349	49,526	35,224
JAPAN
Geographic And Sales [Line Items]
Total net sales		7,345	6,006	19,139	17,781
Other [Member]
Geographic And Sales [Line Items]
Total net sales	[1]	$ 13,349	$ 12,415	$ 42,637	$ 39,763
[1] No other location individually exceeds 10% of the total sales.

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Geographic And Sales [Line Items]

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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://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 3: 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

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-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=116634182&loc=SL114868664-224227

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