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Disaggregation of Sales, Geographic Sales and Product Sales - Net Sales by Geographic Areas (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020
Geographic And Sales [Line Items]
Total net sales		$ 62,367	$ 35,194	$ 113,119	$ 70,381
Geographic Distribution, Domestic [Member]
Geographic And Sales [Line Items]
Total net sales		2,704	882	5,044	2,621
Geographic Distribution, Foreign [Member]
Geographic And Sales [Line Items]
Total net sales		59,663	34,312	108,075	67,760
Geographic Distribution, Foreign [Member] | China [Member]
Geographic And Sales [Line Items]
Total net sales		32,930	18,603	52,573	30,318
Geographic Distribution, Foreign [Member] | JAPAN
Geographic And Sales [Line Items]
Total net sales		9,283	7,463	18,886	15,765
Geographic Distribution, Foreign [Member] | Other [Member]
Geographic And Sales [Line Items]
Total net sales	[1]	$ 17,450	$ 8,246	$ 36,616	$ 21,677
[1] No other location individually exceeds 10% of the total sales.

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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).

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