Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 25, 2020	Mar. 27, 2019
Numerator:
Net income	$ 3,600	$ 913
Denominator:
Weighted-average shares outstanding—basic (shares)	34,659,160	38,653,702
Weighted-average shares outstanding—diluted (shares)	35,347,456	39,496,436
Net income (loss) per share—basic (usd per share)	$ 0.10	$ 0.02
Net income (loss) per share—diluted (usd per share)	$ 0.10	$ 0.02
Anti-dilutive securities not considered in diluted EPS calculation (shares)	474,373	56,016