Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total
Beginning balance (shares) at Dec. 26, 2018	39,009,451
Beginning balance at Dec. 26, 2018	$ 390	$ 375,734	$ (110,888)		$ 265,236
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		1,129			1,129
Issuance of common stock related to restricted stock	$ 3	(3)
Issuance of common stock related to restricted stock (shares)	301,371
Issuance of common stock upon exercise of stock options		80			80
Issuance of common stock upon exercise of stock options (shares)	6,709
Shares repurchased for employee tax withholdings	$ (1)	(294)			(295)
Shares repurchased for employee tax withholdings (shares)	(25,747)
Repurchase of common stock	$ (15)	(18,311)			(18,326)
Repurchase of common stock (shares)	(1,558,836)
Net income			15,000		15,000
Ending balance (shares) at Jun. 26, 2019	37,732,948
Ending balance at Jun. 26, 2019	$ 377	358,335	(95,888)		262,824
Beginning balance (shares) at Mar. 27, 2019	38,730,204
Beginning balance at Mar. 27, 2019	$ 388	372,825	(109,975)		263,238
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		641			641
Issuance of common stock related to restricted stock	$ 3	(3)
Issuance of common stock related to restricted stock (shares)	323,489
Issuance of common stock upon exercise of stock options		80			80
Issuance of common stock upon exercise of stock options (shares)	6,709
Shares repurchased for employee tax withholdings	$ (1)	(278)			(279)
Shares repurchased for employee tax withholdings (shares)	(24,172)
Repurchase of common stock	$ (13)	(14,930)			(14,943)
Repurchase of common stock (shares)	(1,303,282)
Net income			14,087		14,087
Ending balance (shares) at Jun. 26, 2019	37,732,948
Ending balance at Jun. 26, 2019	$ 377	358,335	(95,888)		262,824
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		1,261			1,261
Issuance of common stock related to restricted stock	$ 4	(4)
Issuance of common stock related to restricted stock (shares)	436,263
Issuance of common stock upon exercise of stock options	$ 4	2,161			$ 2,165
Issuance of common stock upon exercise of stock options (shares)	372,556				372,556
Shares repurchased for employee tax withholdings		(280)			$ (280)
Shares repurchased for employee tax withholdings (shares)	(20,193)
Forfeiture of common stock related to restricted shares	(61,086)				(73,497)
Other comprehensive loss, net of taxes				(1,252)	$ (1,252)
Net income			9,099		9,099
Ending balance (shares) at Jun. 24, 2020	35,854,122
Ending balance at Jun. 24, 2020	$ 359	334,088	(76,889)	(999)	256,559
Beginning balance (shares) at Mar. 25, 2020	35,089,983
Beginning balance at Mar. 25, 2020	$ 351	331,484	(82,388)	(842)	248,605
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		727			727
Issuance of common stock related to restricted stock	$ 4	(4)
Issuance of common stock related to restricted stock (shares)	436,263
Issuance of common stock upon exercise of stock options	$ 4	2,161			2,165
Issuance of common stock upon exercise of stock options (shares)	372,556
Shares repurchased for employee tax withholdings		(280)			(280)
Shares repurchased for employee tax withholdings (shares)	(20,193)
Forfeiture of common stock related to restricted shares	(24,487)
Other comprehensive loss, net of taxes				(157)	(157)
Net income			5,499		5,499
Ending balance (shares) at Jun. 24, 2020	35,854,122
Ending balance at Jun. 24, 2020	$ 359	$ 334,088	$ (76,889)	$ (999)	$ 256,559