Basic and Diluted Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jul. 04, 2014	Jun. 28, 2013	Jul. 04, 2014	Jun. 28, 2013
Numerator:
Net income (loss)	$ (1,789)	$ 278	$ (3,148)	$ 749
Weighted average common shares and denominator for basic calculation:
Weighted average common shares outstanding	38,400	36,830	38,247	36,745
Less: Unvested restricted stock	(232)	(334)	(277)	(284)
Denominator for basic calculation	38,168	36,496	37,970	36,461
Weighted average effects of dilutive equity-based compensation awards:
Stock options	0	999	0	746
Restricted stock	0	139	0	94
Warrants	0	708	0	586
Denominator for diluted calculation	38,168	38,342	37,970	37,887
Net income (loss) per share - basic (in dollars per share)	$ (0.05)	$ 0.01	$ (0.08)	$ 0.02
Net income (loss) per share - diluted (in dollars per share)	$ (0.05)	$ 0.01	$ (0.08)	$ 0.02

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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 amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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