Income Taxes - Income Tax Expense (Benefit) Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	$ 6,076	$ 7,081	$ 8,622
Stock based compensation	(2,808)	(1,014)	(1,016)
State taxes, net of Federal benefit	1,990	1,424	714
Federal and state tax credits	(1,247)	(923)	(250)
Changes in unrecognized tax position	425	111	506
Domestic production activities deduction	0	0	(936)
Transition tax	0	110	357
Effect of change in income tax rate	0	31	(6,249)
Other	740	43	(1,121)
Total income tax expense	$ 5,176	$ 6,863	$ 627