Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Apr. 04, 2017	Mar. 29, 2016
Revenue:
Restaurant revenue	$ 115,527	$ 112,865
Franchising royalties and fees	1,188	1,121
Total revenue	116,715	113,986
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of sales	32,087	30,189
Labor	39,594	37,434
Occupancy	14,001	13,314
Other restaurant operating costs	17,147	16,892
General and administrative	10,666	10,037
Depreciation and amortization	6,267	6,906
Pre-opening	545	1,037
Restaurant impairments, closure costs and asset disposals	22,054	1,016
Total costs and expenses	142,361	116,825
Loss from operations	(25,646)	(2,839)
Interest expense, net	1,008	628
Loss before income taxes	(26,654)	(3,467)
Provision (benefit) for income taxes	191	(1,094)
Net loss	(26,845)	(2,373)
Accretion of preferred stock to redemption value	(965)	0
Net loss attributable to common stockholders	$ (27,810)	$ (2,373)
Loss per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ (0.99)	$ (0.09)
Diluted (USD per share)	$ (0.99)	$ (0.09)
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	28,073,333	27,721,792
Diluted (in shares)	28,073,333	27,721,792