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Income Taxes - Additional Information (Detail) - USD ($)
 6 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Dec. 29, 2019
Income Tax Contingency [Line Items]      
Write-off of deferred tax assets related to share based compensation $ 300,000 $ 400,000  
CARES act of 2020, net operating loss (NOL) carryback description The CARES Act allows companies with a net operating loss (“NOL”) in either 2018, 2019 or 2020 to carry back those losses five years.    
CARES act of 2020, net operating loss carryback period 5 years    
Income tax refund received $ 2,100,000    
Unrecognized tax benefits $ 0   $ 0
Unrecognized tax benefits, period Over the next 12 months    
Accrued interest or penalties $ 0   0
Earliest Tax Year [Member] | Federal [Member]      
Income Tax Contingency [Line Items]      
Income tax returns in period 2016    
Earliest Tax Year [Member] | State and Local [Member]      
Income Tax Contingency [Line Items]      
Income tax returns in period 2015    
California Enterprise Zone Tax Credits [Member]      
Income Tax Contingency [Line Items]      
Deferred tax assets valuation allowance $ 1,200,000   $ 1,200,000
Tax credits carry forward latest expiration year 2024