Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2019	Jan. 02, 2018	Jan. 03, 2017
Revenue:
Total revenue	$ 457,841	$ 456,492	$ 487,474
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of sales	121,102	121,473	130,630
Labor	149,746	150,161	161,219
Occupancy	49,020	51,877	55,912
Other restaurant operating costs	65,575	64,091	73,011
General and administrative	46,092	39,746	55,654
Depreciation and amortization	22,872	24,613	28,134
Pre-opening	50	935	3,131
Restaurant impairments, closure costs and asset disposals	7,142	37,446	47,311
Total costs and expenses	461,599	490,342	555,002
Loss from operations	(3,758)	(33,850)	(67,528)
Loss on extinguishment of debt	626	0	0
Interest expense, net	4,305	3,839	2,916
Loss before income taxes	(8,689)	(37,689)	(70,444)
(Benefit) provision for income taxes	(248)	(207)	1,233
Net loss	(8,441)	(37,482)	(71,677)
Accretion of preferred stock to redemption value	0	(7,967)	0
Net loss attributable to common stockholders	$ (8,441)	$ (45,449)	$ (71,677)
Earnings per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ (0.20)	$ (1.20)	$ (2.58)
Diluted (USD per share)	$ (0.20)	$ (1.20)	$ (2.58)
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	42,329,556	37,759,497	27,808,708
Diluted (in shares)	42,329,556	37,759,497	27,808,708
Restaurant revenue
Revenue:
Total revenue	$ 453,671	$ 451,599	$ 482,544
Franchising royalties and fees
Revenue:
Total revenue	$ 4,170	$ 4,893	$ 4,930