Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2018	Jan. 03, 2017	Dec. 29, 2015
Revenue:
Restaurant revenue	$ 451,599	$ 482,544	$ 450,482
Franchising royalties and fees	4,893	4,930	4,969
Total revenue	456,492	487,474	455,451
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of sales	121,473	130,630	120,455
Labor	150,161	161,219	143,145
Occupancy	51,877	55,912	50,300
Other restaurant operating costs	64,091	73,011	63,549
General and administrative	39,746	55,654	37,244
Depreciation and amortization	24,613	28,134	27,802
Pre-opening	935	3,131	4,407
Restaurant impairments, closure costs and asset disposals	37,446	47,311	29,616
Total costs and expenses	490,342	555,002	476,518
Loss from operations	(33,850)	(67,528)	(21,067)
Interest expense, net	3,839	2,916	1,432
Loss before income taxes	(37,689)	(70,444)	(22,499)
(Benefit) provision for income taxes	(207)	1,233	(8,734)
Net loss	(37,482)	(71,677)	(13,765)
Accretion of preferred stock to redemption value	(7,967)	0	0
Net loss attributable to common stockholders	$ (45,449)	$ (71,677)	$ (13,765)
Earnings per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ (1.20)	$ (2.58)	$ (0.48)
Diluted (USD per share)	$ (1.20)	$ (2.58)	$ (0.48)
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	37,759,497	27,808,708	28,938,901
Diluted (in shares)	37,759,497	27,808,708	28,938,901