Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Other Comprehensive Income (Loss) [Member]	Accumulated Deficit
Beginning balance (shares) at Dec. 28, 2016		38,473,772
Beginning balance at Dec. 28, 2016	$ 265,182	$ 385	$ 371,843		$ (107,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,056		1,056
Issuance of common stock related to restricted shares, net (shares)		170,417
Issuance of common stock related to restricted shares, net	0	$ 2	(2)
Issuance of common stock upon exercise of stock options (shares)		17,661
Issuance of common stock upon exercise of stock options	93	$ 0	93
Net income	8,619				8,619
Ending balance (shares) at Dec. 27, 2017		38,661,850
Ending balance at Dec. 27, 2017	274,950	$ 387	372,990		(98,427)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	2,005		2,005
Issuance of common stock related to restricted shares, net (shares)		155,229
Issuance of common stock related to restricted shares, net	$ 0	$ 1	(1)
Issuance of common stock upon exercise of stock options (shares)	269,549	269,549
Issuance of common stock upon exercise of stock options	$ 1,837	$ 3	1,834
Shares repurchased for employee tax withholdings	10,768
Shares repurchased for employee tax withholdings (shares)	$ 114		114
Repurchase of common stock (shares)		66,409
Repurchase of common stock	(981)	$ 1	980
Net income	(8,994)				(8,994)
Ending balance (shares) at Dec. 26, 2018		39,009,451
Ending balance at Dec. 26, 2018	265,236	$ 390	375,734		(110,888)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change (see Note 2) | Accounting Standards Update 2014-09	(3,467)				(3,467)
Stock-based compensation	2,474		2,474
Issuance of common stock related to restricted shares, net (shares)		309,404
Issuance of common stock related to restricted shares, net	$ 0	$ 2	(2)
Issuance of common stock upon exercise of stock options (shares)	234,728	234,728
Issuance of common stock upon exercise of stock options	$ 1,450	$ 2	1,448
Shares repurchased for employee tax withholdings	31,397
Shares repurchased for employee tax withholdings (shares)	$ 365		365
Repurchase of common stock (shares)		4,395,604
Repurchase of common stock	(48,382)	$ 43	48,339
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	253
Net income	24,900				24,900
Ending balance (shares) at Dec. 25, 2019		35,126,582
Ending balance at Dec. 25, 2019	$ 245,566	$ 351	$ 330,950	$ 253	$ (85,988)