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Income Taxes - Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2021
Dec. 29, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Federal income tax provision (benefit) at federal rate $ 784 $ (4,867) $ 368
State income tax provision (benefit), net of federal tax 162 (1,191) 168
Other permanent differences (17) 288 327
Tax credits (1,297) (390) (408)
Change in valuation allowance 244 6,104 (913)
Tax rate change 6 (25) 23
Deferred tax asset write-off 207 157 566
Other items, net (19) 8 (27)
Total provision for income taxes $ 70 $ 84 $ 104
Effective income tax rate 1.90% (0.40%) 5.90%