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Net Income Per Share - Potential Shares of Common Stock Not Included in the Computation of Diluted Net Income (Loss) Per Share (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 27, 2019
Sep. 28, 2018
Potentially dilutive securities        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive shares (in shares) 6,153 5,687 5,740 2,938