Stockholders' Equity - Stock Options Outstanding, Exercisable and Expected to Vest (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Dec. 28, 2019
Stock options outstanding, exercisable and expected to vest
Options outstanding, Number of Shares	1,772,621	1,649,540	1,383,552
Options outstanding, Weighted Average Exercise Price	$ 5.07	$ 4.67	$ 6.11
Options outstanding, Weighted Average Remaining Contractual Life (years)	5 years 5 months 12 days
Options outstanding, Aggregate Intrinsic Value	$ 2,796
Options vested and expected to vest, Number of Shares	1,603,903
Options vested and expected to vest, Weighted Average Exercise Price	$ 5.08
Options vested and expected to vest, Weighted Average Remaining Contractual Life (years)	5 years 4 months 2 days
Options vested and expected to vest, Aggregate Intrinsic Value	$ 2,565
Options exercisable, Number of Shares	693,294
Options exercisable, Weighted Average Exercise Price	$ 5.69
Options exercisable, Weighted Average Remaining Contractual Life (years)	4 years 2 months 26 days
Options exercisable, Aggregate Intrinsic Value	$ 1,035