Net Loss per Share - Computation of Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2023	Mar. 26, 2022
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Line Items]
Earnings (Loss) to Common Shareholders, As reported - basic	$ (8,956)	$ (1,955)
Common shares, As reported - basic	12,309	12,300
EPS, As reported - basic	$ (0.73)	$ (0.16)
Earnings (Loss) to Common Shareholders, Net effect of unvested participating shares	$ (17)	$ (5)
Common Shares, Net effect of unvested participating shares	23	32
Earnings (Loss) to Common Shareholders, Net loss per common share - diluted	$ (8,956)	$ (1,955)
Common Shares, Net loss per common share - diluted	12,309	12,300
EPS, Net loss per common share - diluted	$ (0.73)	$ (0.16)
Common Class A
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Line Items]
Earnings (Loss) to Common Shareholders, As reported - basic	$ (7,434)	$ (1,621)
Common shares, As reported - basic	10,218	10,200
EPS, As reported - basic	$ (0.73)	$ (0.16)
Common Class B
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Line Items]
Earnings (Loss) to Common Shareholders, As reported - basic	$ (1,505)	$ (329)
Common shares, As reported - basic	2,068	2,068
EPS, As reported - basic	$ (0.73)	$ (0.16)
Earnings (Loss) to Common Shareholders, Class B Common Stock	$ (1,505)	$ (329)
Class B Common Stock	2,068	2,068