Disaggregation of Sales, Geographic Sales and Product Sales - Disaggregation of Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Total net sales	$ 47,081	$ 39,055	$ 117,462	$ 111,302
Non Consignment Sales [Member]
Total net sales	42,535	34,696	96,381	98,518
Consignment Sales [Member]
Total net sales	$ 4,546	$ 4,359	$ 21,081	$ 12,784