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Loss Per Share (Narrative) (Details) - shares
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
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     11,333,333  
Options Held [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4,248,761 1,864,830 3,318,583 1,986,406
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 59,981 625,167 105,486 575,776