Income Taxes Income Tax Reconciliation, Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Tax Cuts and Jobs Act Narrative [Abstract]
Federal statutory rate	21.00%	21.00%	35.00%
Federal Statutory Income Tax Rate Effective January 1, 2018		21.00%
Tax reform	$ 0	$ 0	$ 1,749
Increase in the Valuation Allowance Related to the Revised Treatment of Net Operating Losses Under the Tax Act			6,420
Deferred Tax Liabilities, Net	91	568
Income tax provision (benefit)	657	831	$ (7,509)
Effective Income Tax Rate Reconciliation, Percent			36.40%
Tax Reconciliation Details [Abstract]
Change in valuation allowance	(3,400)	3,990	$ 6,470
Income taxes paid, net of tax refunds	$ 128	$ 20	$ 44

Federal Statutory Income Tax Rate Effective January 1, 2018

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Increase in the Valuation Allowance Related to the Revised Treatment of Net Operating Losses Under the Tax Act

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Tax Reconciliation Details [Abstract]

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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