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Basic and Diluted Net Income Per Share - Summary of Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Numerator:
Net income	$ 2,388	$ 1,459	$ 7,669	$ 3,872
Weighted average common shares:
Common shares outstanding	44,573	43,065	44,436	42,076
Less: Unvested restricted stock	(10)	(11)	(10)	(11)
Denominator for basic calculation	44,563	43,054	44,426	42,065
Weighted average effects of potentially diluted common stock:
Diluted	46,857	46,025	46,848	44,618
Net income per share:
Basic	$ 0.05	$ 0.03	$ 0.17	$ 0.09
Diluted	$ 0.05	$ 0.03	$ 0.16	$ 0.09
Employee Stock Option
Weighted average effects of potentially diluted common stock:
Diluted	2,194	2,686	2,260	2,245
Unvested Restricted Stock
Weighted average effects of potentially diluted common stock:
Diluted	2	4	6	12
Restricted Stock Units
Weighted average effects of potentially diluted common stock:
Diluted	98	281	156	296

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