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Disaggregation of Revenues, Geographic Sales and Product Sales - Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 29, 2019 | Mar. 30, 2018
Geographic And Sales [Line Items] |  |  |
Total net sales |  | $ 32,583 | $ 27,093
Geographic Distribution, Domestic [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Total net sales |  | 1,952 | 1,756
Geographic Distribution, Foreign [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Total net sales |  | 30,631 | 25,337
China [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Total net sales |  | 11,771 | 7,910
JAPAN |  |  |
Geographic And Sales [Line Items] |  |  |
Total net sales |  | 5,519 | 5,083
Korea |  |  |
Geographic And Sales [Line Items] |  |  |
Total net sales |  | 3,291 | 2,195
Other [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Total net sales | [1] | $ 12,002 | $ 11,905
[1] | No other location individually exceeds 10% of the total sales.

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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 + Details
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