Annual report pursuant to Section 13 and 15(d)

Employee Benefit Programs - Employee Stock Purchase Plan (Details)

v3.22.4
Employee Benefit Programs - Employee Stock Purchase Plan (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2022
shares
May 31, 2020
shares
Jul. 31, 2017
restaurant
shares
Dec. 25, 2022
USD ($)
$ / shares
shares
Dec. 26, 2021
USD ($)
$ / shares
shares
Dec. 27, 2020
USD ($)
$ / shares
shares
Dec. 29, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total stock-based compensation cost | $       $ 6.3 $ 6.6 $ 4.3  
Share-based compensation arrangement by share-based payment award, number of additional shares authorized (in shares)           275,000 660,000
Employee Stock Purchase Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum number of shares of the company's common stock that may be issued or transferred (in shares)     100,000 600,000      
Maximum percentage of base compensation that can be contributed by the eligible team members     15.00%        
Estimated subscription date fair value (as a percent)     85.00%        
Requisite employment period to be eligible to participate in the plan     1 year        
Requisite working hours per week to be eligible to participate in the plan | restaurant     20        
Operational period of the plan     6 months        
Stock issued during period, shares, employee stock purchase plans (in shares)       63,841 42,563    
Number of shares available for future issuance under the plan (in shares)       55,585      
Risk-free interest rate         0.31% 0.10%  
Expected years until exercise       6 months 6 months 6 months  
Expected stock volatility         53.94% 50.40%  
Dividend yield       0.00% 0.00% 0.00%  
Awarded (in dollars per share) | $ / shares       $ 0.99 $ 4.36 $ 2.16  
Total stock-based compensation cost | $       $ 0.1 $ 0.2 $ 0.1  
Share-based compensation arrangement by share-based payment award, number of additional shares authorized (in shares)   150,000          
Employee Stock Purchase Plan | Subsequent event              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation arrangement by share-based payment award, number of additional shares authorized (in shares) 350,000            
Employee Stock Purchase Plan | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Risk-free interest rate       1.84%      
Expected stock volatility       54.13%      
Employee Stock Purchase Plan | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Risk-free interest rate       4.05%      
Expected stock volatility       55.00%