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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		6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Numerator:
Net income (loss)	$ 1,830	$ (971)	$ 2,413	$ (3,174)
Weighted average common shares
Common shares outstanding	41,734	40,954	41,579	40,862
Less: Unrestricted stock	(11)	(21)	(11)	(21)
Denominator for basic calculation	41,723	40,933	41,568	40,841
Weighted average effects of potentially dilutive common stock:
Denominator for diluted calculation	43,999	40,933	43,654	40,841
Net income (loss) per share - basic	$ 0.04	$ (0.02)	$ 0.06	$ (0.08)
Net income (loss) per share - diluted	$ 0.04	$ (0.02)	$ 0.06	$ (0.08)
Employee Stock Option [Member]
Weighted average effects of potentially dilutive common stock:
Denominator for diluted calculation	2,037	0	1,800	0
Restricted Stock [Member]
Weighted average effects of potentially dilutive common stock:
Denominator for diluted calculation	222	0	269	0
Unvested Restricted Stock [Member]
Weighted average effects of potentially dilutive common stock:
Denominator for diluted calculation	17	0	17	0
Warrant [Member]
Weighted average effects of potentially dilutive common stock:
Denominator for diluted calculation	0	0	0	0

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