Income Taxes Components of Deferred Tax Assets and Liabilities, Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020
Operating Loss Carryforwards [Line Items]
Federal net operating losses	$ 0	$ 556
Valuation allowance	12,851	14,202
Deferred tax liabilities, net	91	91
State net operating losses	3,033	3,305
Federal tax credit carryforwards	4,136	4,413
State tax credit carryforwards	$ 1,669	$ 1,688
Internal Revenue Service (IRS) | Earliest Tax Year
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards and tax credit carryforwards, expiration date	2029
Internal Revenue Service (IRS) | Latest Tax Year
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards and tax credit carryforwards, expiration date	2042
State Taxing Authority
Operating Loss Carryforwards [Line Items]
Federal net operating losses	$ 3,033
Operating loss carryforwards	$ 58,180
State Taxing Authority | Earliest Tax Year
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards and tax credit carryforwards, expiration date	2021
State Taxing Authority | Latest Tax Year
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards and tax credit carryforwards, expiration date	2041