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Quarterly Financial Data (Unaudited) - Schedule Of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 03, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Quarterly Financial Data [Abstract]
Net sales	$ 38,883	$ 39,055	$ 39,664	$ 32,583	$ 31,186	$ 31,770	$ 33,905	$ 27,093	$ 150,185	$ 123,954	$ 90,611
Gross profit	28,824	29,051	29,899	24,180	22,992	23,860	25,227	19,431	111,954	91,510	64,280
Net income (loss)	$ 6,379	$ 2,388	$ 3,914	$ 1,367	$ 1,096	$ 1,459	$ 1,830	$ 583	$ 14,048	$ 4,968	$ (2,139)
Net income per share – basic	$ 0.14	$ 0.05	$ 0.09	$ 0.03	$ 0.02	$ 0.03	$ 0.04	$ 0.01	$ 0.32	$ 0.12	$ (0.05)
Net income per share – diluted	$ 0.14	$ 0.05	$ 0.08	$ 0.03	$ 0.02	$ 0.03	$ 0.04	$ 0.01	$ 0.30	$ 0.11	$ (0.05)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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