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
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Numerator:
Net income	$ 3,892	$ 2,388	$ 2,586	$ 7,669
Weighted average common shares:
Common shares outstanding	45,914	44,573	45,405	44,436
Less: Unvested restricted stock	(11)	(10)	(11)	(10)
Denominator for basic calculation	45,903	44,563	45,394	44,426
Weighted average effects of potentially diluted common stock:
Diluted	48,180	46,857	47,589	46,848
Net income per share:
Basic	$ 0.08	$ 0.05	$ 0.06	$ 0.17
Diluted	$ 0.08	$ 0.05	$ 0.05	$ 0.16
Employee Stock Options
Weighted average effects of potentially diluted common stock:
Diluted	2,208	2,194	2,124	2,260
Unvested Restricted Stock
Weighted average effects of potentially diluted common stock:
Diluted		2	5	6
Restricted Stock Units
Weighted average effects of potentially diluted common stock:
Diluted	68	98	66	156
Performance Stock Units
Weighted average effects of potentially diluted common stock:
Diluted	1