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Income Taxes (Reconciliation of Income Taxes by Applying the Statutory Federal Income Tax Rate) (Details)
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Income Taxes    
Statutory federal income tax rate (as a percent) 21.00% 21.00%
Change in valuation allowance (as a percent) (18.00%) (19.00%)
Other (as a percent) (3.00%) (2.00%)