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Disaggregation of Revenues, Geographic Sales and Product Sales - Net Sales by Geographic Areas (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Jan. 03, 2020 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Jan. 03, 2020 | Dec. 28, 2018 | Dec. 29, 2017
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  | $ 38,883 | $ 39,055 | $ 39,664 | $ 32,583 | $ 31,186 | $ 31,770 | $ 33,905 | $ 27,093 | $ 150,185 | $ 123,954 | $ 90,611
Geographic Distribution, Domestic [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 8,106 | 7,316 | 7,894
Geographic Distribution, Foreign [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 142,079 | 116,638 | 82,717
Geographic Distribution, Foreign [Member] | China [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales | [1] |  |  |  |  |  |  |  |  | 64,820 | 46,070 | 24,473
Geographic Distribution, Foreign [Member] | JAPAN |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 26,881 | 23,151 | 18,125
Geographic Distribution, Foreign [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales | [2] |  |  |  |  |  |  |  |  | $ 50,378 | $ 47,417 | $ 40,119
[1] | The China region includes sales into China and Hong Kong.
[2] | No other location individually exceeds 10% of the total net 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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