Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total
Beginning balance (shares) at Dec. 25, 2019	35,126,582
Beginning balance at Dec. 25, 2019	$ 351	$ 330,950	$ (85,988)	$ 253	$ 245,566
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		534			534
Forfeiture of common stock related to restricted shares (shares)	(36,599)
Other comprehensive income (loss), net of tax				(1,095)	(1,095)
Net income			3,600		3,600
Ending balance (shares) at Mar. 25, 2020	35,089,983
Ending balance at Mar. 25, 2020	$ 351	331,484	(82,388)	(842)	248,605
Beginning balance (shares) at Dec. 30, 2020	36,423,505
Beginning balance at Dec. 30, 2020	$ 364	339,561	(61,514)	(833)	277,578
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		853			853
Issuance of common stock upon exercise of stock options	$ 1	325			$ 326
Issuance of common stock upon exercise of stock options (shares)	61,419				61,419
Forfeiture of common stock related to restricted shares (shares)	(6,241)				(6,241)
Other comprehensive income (loss), net of tax				141	$ 141
Net income			3,964		3,964
Ending balance (shares) at Mar. 31, 2021	36,478,683
Ending balance at Mar. 31, 2021	$ 365	$ 340,739	$ (57,550)	$ (692)	$ 282,862