Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2019	Apr. 03, 2018
Revenue:
Total revenue	$ 110,046	$ 110,526
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Occupancy	12,430	12,763
Other restaurant operating costs	16,456	16,898
General and administrative	10,140	10,268
Depreciation and amortization	5,507	5,820
Pre-opening	0	47
Restaurant impairments, closure costs and asset disposals	420	1,580
Total costs and expenses	111,136	113,204
Income (loss) from operations	(1,090)	(2,678)
Interest expense, net	761	1,138
Income (loss) before income taxes	(1,851)	(3,816)
(Benefit) provision for income taxes	0	(241)
Net income (loss)	(1,851)	(3,575)
Net income (loss) attributable to common stockholders	$ (1,851)	$ (3,575)
Earnings (loss) per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ (0.04)	$ (0.09)
Diluted (USD per share)	$ (0.04)	$ (0.09)
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	43,933,235	41,128,473
Diluted (in shares)	43,933,235	41,128,473
Restaurant revenue
Revenue:
Total revenue	$ 108,765	$ 109,613
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of goods and services sold	29,091	29,256
Franchising royalties and fees, and other
Revenue:
Total revenue	1,281	913
Labor
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of goods and services sold	$ 37,092	$ 36,572