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Net Loss per Share - Computation of Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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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

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