Quarterly Financial Data (Unaudited) - Schedule Of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 01, 2021	Oct. 02, 2020	Jul. 03, 2020	Apr. 03, 2020	Jan. 03, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Jan. 01, 2021	Jan. 03, 2020	Dec. 28, 2018
Quarterly Financial Data [Abstract]
Net sales	$ 45,998	$ 47,081	$ 35,194	$ 35,187	$ 38,883	$ 39,055	$ 39,664	$ 32,583	$ 163,460	$ 150,185	$ 123,954
Gross profit	34,301	34,871	24,430	24,760	28,824	29,051	29,899	24,180	118,362	111,954	91,510
Net income	$ 3,327	$ 3,892	$ (1,172)	$ (134)	$ 6,379	$ 2,388	$ 3,914	$ 1,367	$ 5,913	$ 14,048	$ 4,968
Net income (loss) per share – basic	$ 0.07	$ 0.08	$ (0.03)		$ 0.14	$ 0.05	$ 0.09	$ 0.03	$ 0.13	$ 0.32	$ 0.12
Net income (loss) per share – diluted	$ 0.07	$ 0.08	$ (0.03)		$ 0.14	$ 0.05	$ 0.08	$ 0.03	$ 0.12	$ 0.30	$ 0.11