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Net Loss per Share - Computation of Net Loss Per Share, Basic (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Apr. 01, 2023
Mar. 26, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net loss $ (8,956) $ (1,955)
Allocation of net income for basic:    
Allocation of net loss for basic common stock $ (8,956) $ (1,955)
Weighted average number of shares for basic:    
Common shares, As reported - basic 12,309 12,300
Net loss per share for basic:    
Net loss per common share - basic $ (0.73) $ (0.16)
Common Class A    
Allocation of net income for basic:    
Allocation of net loss for basic common stock $ (7,434) $ (1,621)
Weighted average number of shares for basic:    
Common shares, As reported - basic 10,218 10,200
Net loss per share for basic:    
Net loss per common share - basic $ (0.73) $ (0.16)
Common Class B    
Allocation of net income for basic:    
Allocation of net loss for basic common stock $ (1,505) $ (329)
Weighted average number of shares for basic:    
Common shares, As reported - basic 2,068 2,068
Net loss per share for basic:    
Net loss per common share - basic $ (0.73) $ (0.16)
Unvested participating shares    
Allocation of net income for basic:    
Allocation of net loss for basic unvested participating shares $ (17) $ (5)
Weighted average number of shares for basic:    
Common shares, As reported - basic 23 32