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Basic and Diluted Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 03, 2014 | Sep. 27, 2013 | Jun. 28, 2013 | Mar. 29, 2013 | Dec. 28, 2012 | Sep. 28, 2012 | Jun. 29, 2012 | Mar. 30, 2012 | Jan. 03, 2014 | Dec. 28, 2012 | Dec. 30, 2011
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (876) | $ 525 | $ 278 | $ 471 | $ (1,414) | $ (90) | $ (491) | $ 232 | $ 398 | $ (1,763) | $ 1,348
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  |  |  |  |  |  |  | 37,017 | 36,433 | 35,578
Less: Unvested restricted stock |  |  |  |  |  |  |  |  | (311) | (180) | (144)
Denominator for basic calculation |  |  |  |  |  |  |  |  | 36,706 | 36,253 | 35,434
Weighted average effects of potentially dilutive common stock: |  |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  | 414 | 0 | 585
Denominator for diluted calculation |  |  |  |  |  |  |  |  | 38,607 | 36,253 | 36,878
Net income (loss) per share - basic (in dollars per share) | $ (0.02) | $ 0.01 | $ 0.01 | $ 0.01 | $ (0.04) | $ 0.00 | $ (0.01) | $ 0.01 | $ 0.01 | $ (0.05) | $ 0.04
Net income (loss) per share - diluted (in dollars per share) | $ (0.02) | $ 0.01 | $ 0.01 | $ 0.01 | $ (0.04) | $ 0.00 | $ (0.01) | $ 0.01 | $ 0.01 | $ (0.05) | $ 0.04
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Weighted average effects of potentially dilutive common stock: |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number Diluted Shares Outstanding Adjustment, Total |  |  |  |  |  |  |  |  | 177 | 0 | 0
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Weighted average effects of potentially dilutive common stock: |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number Diluted Shares Outstanding Adjustment, Total |  |  |  |  |  |  |  |  | 75 | 0 | 0
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |
Weighted average effects of potentially dilutive common stock: |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number Diluted Shares Outstanding Adjustment, Total |  |  |  |  |  |  |  |  | 1,235 | 0 | 859

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