Stockholders' Equity - Stock Options Outstanding, Exercisable and Expected to Vest (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Stock options outstanding, exercisable and expected to vest
Options outstanding, Number of Shares	2,232,967	1,772,621	1,649,540
Options outstanding, Weighted Average Exercise Price	$ 4.27	$ 5.07	$ 4.67
Options outstanding, Weighted Average Remaining Contractual Life (years)	4 years 11 months 23 days
Options outstanding, Aggregate Intrinsic Value	$ 1
Options vested and expected to vest, Number of Shares	2,116,879
Options vested and expected to vest, Weighted Average Exercise Price	$ 4.31
Options vested and expected to vest, Weighted Average Remaining Contractual Life (years)	4 years 11 months 1 day
Options vested and expected to vest, Aggregate Intrinsic Value	$ 1
Options exercisable, Number of Shares	966,593
Options exercisable, Weighted Average Exercise Price	$ 4.87
Options exercisable, Weighted Average Remaining Contractual Life (years)	3 years 10 months 20 days
Options exercisable, Aggregate Intrinsic Value	$ 1