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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
--- | --- | ---
Dec. 31, 2021 | Oct. 01, 2021 | Jul. 02, 2021 | Apr. 02, 2021 | Jan. 01, 2021 | Oct. 02, 2020 | Jul. 03, 2020 | Apr. 03, 2020 | Dec. 31, 2021 | Jan. 01, 2021 | Jan. 03, 2020
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  | $ 59,001 | $ 58,352 | $ 62,367 | $ 50,752 | $ 45,998 | $ 47,081 | $ 35,194 | $ 35,187 | $ 230,472 | $ 163,460 | $ 150,185
Geographic Distribution, Domestic [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 10,095 | 6,158 | 8,106
Geographic Distribution, Foreign [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 220,377 | 157,302 | 142,079
Geographic Distribution, Foreign [Member] | China [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales | [1] |  |  |  |  |  |  |  |  | 107,333 | 71,692 | 64,820
Geographic Distribution, Foreign [Member] | JAPAN |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 40,973 | 34,986 | 26,881
Geographic Distribution, Foreign [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales | [2] |  |  |  |  |  |  |  |  | $ 72,071 | $ 50,624 | $ 50,378
[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. 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