Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding Used to Compute Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Jul. 03, 2021	Jun. 27, 2020	Oct. 02, 2021	Sep. 26, 2020
Accounting Policies [Abstract]
Net income	$ 9,584	$ 6,501	$ 15,118	$ 13,020	$ 24,702	$ 19,521
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding (in shares)	11,920	11,703			11,862	11,660
Dilutive potential common shares (in shares)	322	256			386	226
Diluted weighted-average common shares outstanding (in shares)	12,242	11,959			12,248	11,886
Earnings per share
Basic (in dollars per share)	$ 0.80	$ 0.56			$ 2.08	$ 1.67
Diluted (in dollars per share)	$ 0.78	$ 0.54			$ 2.02	$ 1.64