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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. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Numerator:
Net income (loss)	$ 1,173	$ (1,778)	$ (2,001)	$ (11,962)
Weighted average common shares and denominator for basic calculation:
Weighted average common shares outstanding	41,131	40,501	40,960	40,242
Less: Unvested restricted stock	21	15	21	15
Denominator for basic and diluted calculation	41,110	40,486	40,939	40,227
Effect of dilutive shares:
Denominator for diluted calculation	42,104	40,486	40,939	40,227
Net income (loss) per share - basic	$ 0.03	$ (0.04)	$ (0.05)	$ (0.30)
Net income (loss) per share - diluted	$ 0.03	$ (0.04)	$ (0.05)	$ (0.30)
Employee Stock Option [Member]
Effect of dilutive shares:
Weighted Average Number Diluted Shares Outstanding Adjustment	837	0	0	0
Restricted Stock [Member]
Effect of dilutive shares:
Weighted Average Number Diluted Shares Outstanding Adjustment	157	0	0	0

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