Basic and Diluted Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 03, 2014	Sep. 27, 2013	Oct. 03, 2014	Sep. 27, 2013
Numerator:
Net income (loss)	$ (2,706)	$ 525	$ (5,854)	$ 1,274
Weighted average common shares and denominator for basic calculation:
Weighted average common shares outstanding	38,618	37,108	38,311	36,860
Less: Unvested restricted stock	249	358	267	308
Denominator for basic calculation	38,369	36,750	38,044	36,552
Weighted average effects of dilutive equity-based compensation awards:
Employee stock options and restricted stock	0	1,612	0	1,188
Warrants	0	922	0	742
Denominator for diluted calculation	38,369	39,284	38,044	38,482
Net income (loss) per share - basic (in dollars per share)	$ (0.07)	$ 0.01	$ (0.15)	$ 0.03
Net income (loss) per share - diluted (in dollars per share)	$ (0.07)	$ 0.01	$ (0.15)	$ 0.03