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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		9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Numerator:
Net income (loss)	$ 1,459	$ 1,173	$ 3,872	$ (2,001)
Weighted average common shares:
Common shares outstanding	43,065	41,131	42,076	40,960
Less: Unrestricted stock	(11)	(21)	(11)	(21)
Denominator for basic calculation	43,054	41,110	42,065	40,939
Weighted average effects of potentially dilutive common stock:
Denominator for diluted calculation	46,025	42,104	44,618	40,939
Net income (loss) per share - basic	$ 0.03	$ 0.03	$ 0.09	$ (0.05)
Net income (loss) per share - diluted	$ 0.03	$ 0.03	$ 0.09	$ (0.05)
Employee Stock Option [Member]
Weighted average effects of potentially dilutive common stock:
Denominator for diluted calculation	2,686	837	2,245	0
Restricted Stock [Member]
Weighted average effects of potentially dilutive common stock:
Denominator for diluted calculation	281	157	296	0
Unvested Restricted Stock [Member]
Weighted average effects of potentially dilutive common stock:
Denominator for diluted calculation	4	0	12	0
Warrant [Member]
Weighted average effects of potentially dilutive common stock:
Denominator for diluted calculation	0	0	0	0

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