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Basic and Diluted Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Sep. 27, 2013
Sep. 28, 2012
Numerator:        
Net income (loss) $ 525 $ (90) $ 1,274 $ (349)
Denominator:        
Weighted average common shares outstanding 37,108 36,495 36,860 36,378
Less: Unvested restricted stock 358 203 308 172
Denominator for basic calculation 36,750 36,292 36,552 36,206
Weighted average effects of dilutive equity-based compensation awards:        
Employee stock options and restricted stock 1,612 0 1,188 0
Warrants 922 0 742 0
Denominator for diluted calculation 39,284 36,292 38,482 36,206
Net income (loss) per share - basic (in dollars per share) $ 0.01 $ 0.00 $ 0.03 $ (0.01)
Net income (loss) per share - diluted (in dollars per share) $ 0.01 $ 0.00 $ 0.03 $ (0.01)