Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Apr. 02, 2019
Revenue:
Total revenue	$ 100,348	$ 110,046
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Other restaurant operating costs	16,689	16,456
General and administrative	10,554	10,140
Depreciation and amortization	5,335	5,507
Pre-opening	73	0
Restaurant impairments, closure costs and asset disposals	1,056	420
Total costs and expenses	105,202	111,136
Loss from operations	(4,854)	(1,090)
Interest expense, net	968	761
Loss before taxes	(5,822)	(1,851)
Provision for income taxes	13	0
Net loss and comprehensive loss	$ (5,835)	$ (1,851)
Loss per Class A and Class B common stock, combined
Basic (USD per share)	$ (0.13)	$ (0.04)
Diluted (USD per share)	$ (0.13)	$ (0.04)
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	44,142,220	43,933,235
Diluted (in shares)	44,142,220	43,933,235
Restaurant revenue
Revenue:
Total revenue	$ 98,716	$ 108,765
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Restaurant operating costs	25,204	29,091
Franchising royalties and fees, and other
Revenue:
Total revenue	1,632	1,281
Labor
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Restaurant operating costs	34,231	37,092
Occupancy
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Restaurant operating costs	$ 12,060	$ 12,430