Basic and Diluted Income (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 04, 2014	Mar. 29, 2013
Numerator:
Net income (loss)	$ (1,359)	$ 471
Weighted average common shares and denominator for basic calculation:
Weighted average common shares outstanding	38,116	36,660
Less: Unvested restricted stock	322	233
Denominator for basic calculation	37,794	36,427
Weighted average effects of potentially dilutive common stock:
Stock options	0	522
Warrants	0	400
Denominator for diluted calculation	37,794	37,418
Net income (loss) per share - basic (in dollars per share)	$ (0.04)	$ 0.01
Net income (loss) per share - diluted (in dollars per share)	$ (0.04)	$ 0.01
Restricted Stock [Member]
Weighted average effects of potentially dilutive common stock:
Restricted stock	0	69