Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
Beginning balance at Dec. 26, 2014	$ 188,552	$ 30	$ 149,804	$ 38,718
Beginning balance, Shares at Dec. 26, 2014		29,562,338
Issuance of restricted common stock, Shares		56,000
Issuance under employee stock plans	2,411		2,411
Issuance under employee stock plans, Shares		763,529
Amortization of stock-based compensation	3,660		3,660
Excess tax benefit from stock-based compensation	(77)		(77)
Employees’ taxes paid upon vesting of restricted stock units	(330)		(330)
Employees' taxes paid upon vesting of restricted stock units, Shares		(39,938)
Common stock issued for acquisitions	17,477	$ 2	17,475
Common stock issued for acquisitions, Shares		1,937,500
Net income (loss)	(10,732)			(10,732)
Other comprehensive income (loss)	(18)				$ (18)
Ending balance at Dec. 25, 2015	200,943	$ 32	172,943	27,986	(18)
Ending balance, Shares at Dec. 25, 2015		32,279,429
Issuance of restricted common stock, Shares		52,000
Issuance under employee stock plans	602	$ 1	601
Issuance under employee stock plans, Shares		761,824
Amortization of stock-based compensation	5,671		5,671
Employees’ taxes paid upon vesting of restricted stock units	(771)		(771)
Employees' taxes paid upon vesting of restricted stock units, Shares		(136,968)
Net income (loss)	10,051			10,051
Other comprehensive income (loss)	(365)				(365)
Ending balance at Dec. 30, 2016	216,131	$ 33	178,444	38,037	(383)
Ending balance, Shares at Dec. 30, 2016		32,956,285
Issuance of restricted common stock, Shares		45,000
Issuance under employee stock plans	1,816	$ 1	1,815
Issuance under employee stock plans, Shares		823,440
Amortization of stock-based compensation	7,757		7,757
Employees’ taxes paid upon vesting of restricted stock units	(2,714)		(2,714)
Employees' taxes paid upon vesting of restricted stock units, Shares		(159,785)
Net income (loss)	75,085			75,085
Other comprehensive income (loss)	2,230				2,230
Ending balance at Dec. 29, 2017	$ 300,305	$ 34	$ 185,302	$ 113,122	$ 1,847
Ending balance, Shares at Dec. 29, 2017		33,664,940