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Disaggregation of Sales, Geographic Sales and Product Sales - Net Sales by Geographic Areas (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 03, 2020 | Mar. 29, 2019
Geographic And Sales [Line Items] |  |  |
Total net sales |  | $ 35,187 | $ 32,583
Geographic Distribution, Domestic [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Total net sales |  | 1,739 | 1,952
Geographic Distribution, Foreign [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Total net sales |  | 33,448 | 30,631
Geographic Distribution, Foreign [Member] | China [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Total net sales |  | 11,715 | 11,771
Geographic Distribution, Foreign [Member] | JAPAN |  |  |
Geographic And Sales [Line Items] |  |  |
Total net sales |  | 8,302 | 5,519
Geographic Distribution, Foreign [Member] | Other [Member] |  |  |
Geographic And Sales [Line Items] |  |  |
Total net sales | [1] | $ 13,431 | $ 13,341
[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://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 + Details
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