Earnings Per Share - Computation of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2021	Sep. 23, 2020	Sep. 29, 2021	Sep. 23, 2020
Numerator:
Net income	$ 10,161	$ 9,920	$ 22,943	$ 19,019
Denominator:
Weighted-average shares outstanding-Basic (shares)	36,067,754	35,471,452	35,930,246	34,989,007
Weighted-average shares outstanding-Diluted (shares)	36,525,424	36,064,559	36,457,110	35,609,320
Net income per share-Basic (usd per share)	$ 0.28	$ 0.28	$ 0.64	$ 0.54
Net income per share-Diluted (usd per share)	$ 0.28	$ 0.28	$ 0.63	$ 0.53
Anti-dilutive securities not considered in diluted EPS calculation (shares)	225,308	4,071	118,968	129,218