Basis Of Presentation And Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2022	Sep. 29, 2021	Sep. 28, 2022	Sep. 29, 2021	Dec. 29, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment, net	$ 78,107		$ 78,107		$ 75,668
Impairment of property and equipment	$ 100	$ 34	$ 353	$ 293
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]	Restructuring Costs and Asset Impairment Charges		Restructuring Costs and Asset Impairment Charges
Impairment of Right-of-Use Assets	$ 39	0	$ 39	407
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability					396
Fair Value, Measurements, Recurring [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability					$ 396
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment, net	0	0	0	0
Right-of-Use Assets, Net	332	424	332	424
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment, net	0	0	0	0
Right-of-Use Assets, Net	0	0	0	0
Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment, net	0	0	0	0
Right-of-Use Assets, Net	0	0	0	0
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment, net	0	0	0	0
Right-of-Use Assets, Net	$ 332	$ 424	$ 332	$ 424