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Income Taxes (Components of Loss Before Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Income Taxes    
United States $ (11,916) $ (16,568)
Foreign (523) (554)
Loss before provision for income tax $ (12,439) $ (17,122)