Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjustment	Total
Beginning balance (shares) at Dec. 27, 2017	38,661,850
Beginning balance (Accounting Standards Update 2014-09) at Dec. 27, 2017						$ 3,500
Beginning balance at Dec. 27, 2017	$ 387	$ 372,990	$ (3,467)	$ (98,427)		$ (3,467)	$ 274,950
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		2,005					2,005
Issuance of common stock related to restricted shares, net	$ 1	(1)					0
Issuance of common stock related to restricted shares, net (shares)	155,229
Issuance of common stock upon exercise of stock options	$ 3	1,834					1,837
Issuance of common stock upon exercise of stock options (shares)	269,549
Shares repurchased for employee tax withholdings		(114)					(114)
Shares repurchased for employee tax withholdings (shares)	(10,768)
Repurchase of common stock	$ (1)	(980)					(981)
Repurchase of common stock (shares)	(66,409)
Other comprehensive income (loss), net of income tax							0
Net income (loss)				(8,994)			(8,994)
Ending balance (shares) at Dec. 26, 2018	39,009,451
Ending balance at Dec. 26, 2018	$ 390	375,734		(110,888)			265,236
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		2,474					2,474
Issuance of common stock related to restricted shares, net	$ 2	(2)					0
Issuance of common stock related to restricted shares, net (shares)	309,404
Issuance of common stock upon exercise of stock options	$ 2	1,448					$ 1,450
Issuance of common stock upon exercise of stock options (shares)	234,728						234,728
Shares repurchased for employee tax withholdings		(365)					$ (365)
Shares repurchased for employee tax withholdings (shares)	(31,397)
Forfeiture of common stock related to restricted shares (shares)							(53,882)
Repurchase of common stock	$ (43)	(48,339)					$ (48,382)
Repurchase of common stock (shares)	(4,395,604)
Other comprehensive income (loss), net of income tax					$ 253		253
Net income (loss)				24,900			24,900
Ending balance (shares) at Dec. 25, 2019	35,126,582
Ending balance at Dec. 25, 2019	$ 351	330,950		(85,988)	253		245,566
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		3,093					3,093
Issuance of common stock related to restricted shares, net	$ 4	(4)					0
Issuance of common stock related to restricted shares, net (shares)	439,061
Issuance of common stock upon exercise of stock options	$ 10	5,856					$ 5,866
Issuance of common stock upon exercise of stock options (shares)	970,736						970,736
Shares repurchased for employee tax withholdings		(335)					$ (335)
Shares repurchased for employee tax withholdings (shares)	(23,407)
Forfeiture of common stock related to restricted shares	$ (1)	1					$ 0
Forfeiture of common stock related to restricted shares (shares)	(89,467)						(101,878)
Other comprehensive income (loss), net of income tax					(1,086)		$ (1,086)
Net income (loss)				24,474			24,474
Ending balance (shares) at Dec. 30, 2020	36,423,505
Ending balance at Dec. 30, 2020	$ 364	$ 339,561		$ (61,514)	$ (833)		$ 277,578