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Loss Per Share (Narrative) (Details) - shares
3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Stock Options And Restricted Stock Units [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,360,975 59,981 975,742 105,486
Stock Options [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,767,856 4,248,761 3,286,487 3,318,583
Series B Preferred Stock [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Common shares issuable on an if-converted basis adjusted to diluted EPS 12,178,667   12,178,667  
Series A Preferred Stock [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Common shares issuable on an if-converted basis adjusted to diluted EPS 12,633,429 11,333,333 12,633,429 11,333,333