Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2018	Oct. 03, 2017	Oct. 02, 2018	Oct. 03, 2017
Revenue:
Restaurant revenue	$ 115,552	$ 113,020	$ 341,616	$ 340,175
Franchising royalties and fees	1,175	1,191	3,032	3,543
Total revenue	116,727	114,211	344,648	343,718
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of sales	30,617	29,955	90,962	91,640
Labor	37,738	36,897	112,353	112,921
Occupancy	12,035	12,709	37,155	39,340
Other restaurant operating costs	16,224	15,811	49,997	49,152
General and administrative	10,399	9,807	35,480	29,866
Depreciation and amortization	5,790	6,183	17,407	18,729
Pre-opening	0	69	50	860
Restaurant impairments, closure costs and asset disposals	1,792	10,263	5,952	35,147
Total costs and expenses	114,595	121,694	349,356	377,655
Income (loss) from operations	2,132	(7,483)	(4,708)	(33,937)
Loss on extinguishment of debt	0	0	626	0
Interest expense, net	1,093	893	3,385	2,828
Income (loss) before income taxes	1,039	(8,376)	(8,719)	(36,765)
(Benefit) provision for income taxes	(11)	(41)	(259)	230
Net income (loss)	1,050	(8,335)	(8,460)	(36,995)
Accretion of preferred stock to redemption value	0	0	0	(7,967)
Net income (loss) attributable to common stockholders	$ 1,050	$ (8,335)	$ (8,460)	$ (44,962)
Earnings (loss) per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ 0.02	$ (0.20)	$ (0.20)	$ (1.23)
Diluted (USD per share)	$ 0.02	$ (0.20)	$ (0.20)	$ (1.23)
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	43,094,524	41,109,827	41,798,640	36,639,382
Diluted (in shares)	44,829,363	41,109,827	41,798,640	36,639,382