Income Taxes - Components of Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2020	Dec. 31, 2019	Jan. 01, 2019
Current tax provision:
Federal	$ 0	$ 0	$ 0
State	44	36	35
Total current tax provision	44	36	35
Deferred tax provision (benefit):
Federal	30	52	(202)
State	10	16	(81)
Total deferred tax provision (benefit)	40	68	(283)
Total provision (benefit) for income taxes	$ 84	$ 104	$ (248)