Basic and Diluted Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Numerator:
Net (loss) income	$ (491)	$ 861	$ (259)	$ 1,161
Weighted average common shares and denominator for basic calculation:
Weighted average common shares outstanding (in shares)	36,452	35,599	36,341	35,449
Less: Unvested restricted stock (in shares)	(195)	(156)	(177)	(133)
Denominator for basic calculation (in shares)	36,257	35,443	36,164	35,316
Weighted average effects of dilutive equity-based compensation awards:
Employee stock options (in shares)	0	644	0	688
Warrants (in shares)	0	352	0	385
Denominator for diluted calculation (in shares)	36,257	36,439	36,164	36,389
Net (loss) income per share - basic (in dollars per share)	$ (0.01)	$ 0.02	$ (0.01)	$ 0.03
Net (loss) income per share - diluted (in dollars per share)	$ (0.01)	$ 0.02	$ (0.01)	$ 0.03

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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