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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Apr. 04, 2020
Mar. 30, 2019
Earnings Per Share    
Net income $ 2,244 $ 5,398
Shares used in computing basic earnings per share 43,642 43,189
Effect of dilutive securities:    
Stock-based awards and convertible debt 746 527
Shares used in computing diluted earnings per share 44,388 43,716
Earnings per share:    
Basic (in dollars per share) $ 0.05 $ 0.12
Diluted (in dollars per share) $ 0.05 $ 0.12
Shares attributable to dilutive effect of conversion of debt securities 300 0
RSUs and MSUs    
Earnings per share:    
Shares excluded from computation of diluted earning per share 200 500