Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 29, 2020	Dec. 31, 2019	Jan. 01, 2019	Jan. 02, 2018
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Income tax credit carryforwards	$ 27,506,000	$ 12,949,000
Net operating losses	4,305,000	1,744,000
Valuation allowances against net operating loss and tax credit carryforwards	802,000	282,000
Accrued penalties and interest to uncertain tax positions	100,000	100,000
Unrecognized tax benefits	1,333,000	$ 1,345,000	$ 1,532,000	$ 1,516,000
Unrecognized tax benefits that would impact effective tax rate, if reversed	1,000,000.0
Anticipated decrease in liability for unrecognized tax benefits within next twelve-month period	0
Tax Year 2015
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Net operating losses	33,200,000
Federal
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Income tax credit carryforwards	$ 27,600,000
Tax credits expiration year	2035
Federal | Earliest Tax Year
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Income tax examination, years open	2015
State or Local Taxing Jurisdiction
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Income tax credit carryforwards	$ 800,000
Tax credits expiration year	2023
State or Local Taxing Jurisdiction | Earliest Tax Year
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Income tax examination, years open	2015
Expiration Periods Beginning 2021 Through 2040
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
State net operating losses	$ 89,400,000