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
	Jul. 03, 2021	Apr. 03, 2021	Jun. 27, 2020	Mar. 28, 2020	Jul. 03, 2021	Jun. 27, 2020
Accounting Policies [Abstract]
Net income	$ 8,423	$ 6,695	$ 5,090	$ 7,930	$ 15,118	$ 13,020
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding (in shares)	11,878		11,665		11,834	11,638
Dilutive potential common shares (in shares)	370		163		414	207
Diluted weighted-average common shares outstanding (in shares)	12,248		11,828		12,248	11,845
Earnings per share
Basic (in dollars per share)	$ 0.71		$ 0.44		$ 1.28	$ 1.12
Diluted (in dollars per share)	$ 0.69		$ 0.43		$ 1.23	$ 1.10