Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning balance (shares) at Dec. 30, 2015		38,284,435
Beginning balance at Dec. 30, 2015	$ 244,633	$ 383	$ 369,635	$ (125,385)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation	1,063		1,063
Issuance of common stock related to restricted shares, net (shares)		41,611
Issuance of common stock related to restricted shares, net	0
Issuance of common stock upon exercise of stock options (shares)		147,726
Issuance of common stock upon exercise of stock options	978	$ 2	976
Excess income tax benefit related to share-based compensation plans	169		169
Net income	18,339			18,339
Ending balance (shares) at Dec. 28, 2016		38,473,772
Ending 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	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)