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Income Taxes - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019 | Dec. 28, 2019
Income Taxes [Line Items] |  |  |  |  |
Provision for income taxes | $ 8,000 | $ 7,000 | $ 20,000 | $ 22,000 |
Unrecognized tax benefits |  |  |  |  | $ 1,200,000
Unrecognized tax benefits recognition impact on income tax rate |  |  |  |  | $ 0
Federal |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax returns examination period |  |  | 3 years |  |
Minimum | State Jurisdictions |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax returns examination period |  |  | 3 years |  |
Maximum | State Jurisdictions |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax returns examination period |  |  | 5 years |  |

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