Basic and Diluted Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Numerator:
Net income (loss)	$ 278	$ (491)	$ 749	$ (259)
Denominator:
Weighted average common shares outstanding	36,830	36,452	36,745	36,341
Less: Unvested restricted stock	(334)	(195)	(284)	(177)
Denominator for basic calculation	36,496	36,257	36,461	36,164
Weighted average effects of dilutive equity-based compensation awards:
Employee stock options and restricted stock	1,138	0	840	0
Warrants	708	0	586	0
Denominator for diluted calculation	38,342	36,257	37,887	36,164
Net income (loss) per share - basic (in dollars per share)	$ 0.01	$ (0.01)	$ 0.02	$ (0.01)
Net income (loss) per share - diluted (in dollars per share)	$ 0.01	$ (0.01)	$ 0.02	$ (0.01)