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	6 Months Ended
Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Numerator:
Net income	$ 3,914	$ 1,830	$ 5,281	$ 2,413
Weighted average common shares:
Common shares outstanding	44,489	41,734	44,368	41,579
Less: Unvested restricted stock	(10)	(11)	(11)	(11)
Denominator for basic calculation	44,479	41,723	44,357	41,568
Weighted average effects of potentially diluted common stock:
Diluted	46,733	43,999	46,842	43,654
Net income per share:
Basic	$ 0.09	$ 0.04	$ 0.12	$ 0.06
Diluted	$ 0.08	$ 0.04	$ 0.11	$ 0.06
Employee Stock Option
Weighted average effects of potentially diluted common stock:
Diluted	2,149	2,037	2,292	1,800
Unvested Restricted Stock
Weighted average effects of potentially diluted common stock:
Diluted	97	17	185	17
Restricted Stock Units
Weighted average effects of potentially diluted common stock:
Diluted	8	222	8	269

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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