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Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Jan. 02, 2015	Oct. 03, 2014	Jul. 04, 2014	Apr. 04, 2014	Jan. 01, 2016	Jan. 02, 2015	Jan. 03, 2014
Numerator:
Net income (loss)	$ (842)	$ (1,752)	$ (1,599)	$ (2,340)	$ (2,538)	$ (2,706)	$ (1,789)	$ (1,359)	$ (6,533)	$ (8,392)	$ 398
Weighted average common shares and denominator for basic calculation:
Weighted average common shares outstanding									39,384	38,342	37,017
Less: Unvested restricted stock									(124)	(251)	(311)
Denominator for basic and diluted calculation									39,260	38,091	36,706
Denominator for diluted calculation									39,260	38,091	38,607
Weighted average effects of potentially dilutive common stock:
Warrants									0	0	414
Net income (loss) per share - basic and diluted (in dollars per share)	$ (0.02)	$ (0.04)	$ (0.04)	$ (0.06)	$ (0.07)	$ (0.07)	$ (0.05)	$ (0.04)	$ (0.17)	$ (0.22)	$ 0.01
Employee Stock Option [Member]
Weighted average effects of potentially dilutive common stock:
Weighted Average Number Diluted Shares Outstanding Adjustment, Total									0	0	1,235
Restricted Stock [Member]
Weighted average effects of potentially dilutive common stock:
Weighted Average Number Diluted Shares Outstanding Adjustment, Total									0	0	177
Restricted Stock Units (RSUs) [Member]
Weighted average effects of potentially dilutive common stock:
Weighted Average Number Diluted Shares Outstanding Adjustment, Total									0	0	75

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