Disaggregation of Sales, Geographic Sales and Product Sales - Net Sales by Geographic Areas (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 01, 2021	Oct. 02, 2020	Oct. 01, 2021	Oct. 02, 2020
Geographic And Sales [Line Items]
Total net sales		$ 58,352	$ 47,081	$ 171,471	$ 117,462
Geographic Distribution, Domestic [Member]
Geographic And Sales [Line Items]
Total net sales		2,385	1,477	7,429	4,098
Geographic Distribution, Foreign [Member]
Geographic And Sales [Line Items]
Total net sales		55,967	45,604	164,042	113,364
Geographic Distribution, Foreign [Member] | China [Member]
Geographic And Sales [Line Items]
Total net sales		28,411	23,301	80,984	53,619
Geographic Distribution, Foreign [Member] | JAPAN
Geographic And Sales [Line Items]
Total net sales		10,488	9,208	29,374	24,973
Geographic Distribution, Foreign [Member] | Other [Member]
Geographic And Sales [Line Items]
Total net sales	[1]	$ 17,068	$ 13,095	$ 53,684	$ 34,772

[1] No other location individually exceeds 10% of the total sales.