Quarterly report pursuant to Section 13 or 15(d)

Net (Loss) Income Per Share - Computation of Basic and Diluted Net (Loss) Income Per Share (Details)

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Net (Loss) Income Per Share - Computation of Basic and Diluted Net (Loss) Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Numerator:        
(Loss) income from continuing operations $ (485) $ 26,918 $ 250 $ 27,734
Dividends on Series A Convertible Preferred Stock 40 49 80 108
(Loss) income from continuing operations available to common shares $ (525) $ 26,869 $ 170 $ 27,626
Denominator:        
Weighted-average common shares outstanding (basic) (in shares) 34,972 35,332 34,896 34,921
Common equivalent shares from common stock options, restricted stock, preferred stock and warrants (in shares) 0 4,601 362 5,158
Weighted-average common shares outstanding (diluted) (in shares) 34,972 39,933 35,258 40,079
Basic net (loss) income from continuing operations per share (in usd per share) $ (0.02) $ 0.76 $ 0.00 $ 0.79
Diluted net (loss) income from continuing operations per share (in usd per share) $ (0.02) $ 0.67 $ 0.00 $ 0.69