Income Taxes - Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2023	Dec. 28, 2021	Dec. 29, 2020
Income Tax Disclosure [Abstract]
Federal income tax (benefit) provision at federal rate	$ (688)	$ 784	$ (4,867)
State income tax (benefit) provision, net of federal tax	(112)	162	(1,191)
Other permanent differences	368	(17)	288
Tax credits	(1,608)	(1,297)	(390)
Change in valuation allowance	1,558	244	6,104
Tax rate change	0	6	(25)
Deferred tax asset write-off	320	207	157
Other items, net	199	(19)	8
Total provision for income taxes	$ 37	$ 70	$ 84
Effective income tax rate	(1.10%)	1.90%	(0.40%)