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Income Taxes - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Dec. 30, 2017
Income Taxes [Line Items] |  |  |  |  |
Provision for income taxes | $ 6,000 | $ 9,000 | $ 14,000 | $ 23,000 |
Unrecognized tax benefits |  |  |  |  | $ 1,000,000
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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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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