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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
	Mar. 30, 2018	Mar. 31, 2017
Numerator:
Net income (loss)	$ 583	$ (2,203)
Weighted average common shares and denominator for basic calculation:
Weighted average common shares outstanding	41,431	40,772
Less: Unvested restricted stock	(21)	(23)
Denominator for basic calculation	41,410	40,749
Weighted average effects of potentially dilutive common stock:
Weighted Average Number Diluted Shares Outstanding Adjustment	43,087	40,749
Net income (loss) per share - basic	$ 0.01	$ (0.05)
Net income (loss) per share - diluted	$ 0.01	$ (0.05)
Employee Stock Option [Member]
Weighted average effects of potentially dilutive common stock:
Weighted Average Number Diluted Shares Outstanding Adjustment	1,396	0
Restricted Stock [Member]
Weighted average effects of potentially dilutive common stock:
Weighted Average Number Diluted Shares Outstanding Adjustment	17	0
Unvested Restricted Stock [Member]
Weighted average effects of potentially dilutive common stock:
Weighted Average Number Diluted Shares Outstanding Adjustment	264	0
Warrant [Member]
Weighted average effects of potentially dilutive common stock:
Weighted Average Number Diluted Shares Outstanding Adjustment	0	0

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