Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Jan. 02, 2018
Operating activities
Net (loss) income	$ (118,285)	$ 18,959	$ 49,871
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Allowance for doubtful accounts	41	45	0
Depreciation and amortization	25,488	25,794	23,362
Amortization of favorable and unfavorable lease assets and liabilities, net	0	(767)	(809)
Amortization of deferred financing costs, debt discount and interest rate cap	550	445	389
Operating Lease, Right-of-Use Asset, Amortization	21,681	0	0
Stock-based compensation	6,293	6,079	4,876
Goodwill, Impairment Loss	118,250	0	0
Impairment of long-lived assets	7,159	3,861	0
Deferred income taxes	(583)	1,097	(22,594)
Loss on disposal of assets and adjustments to assets held for sale, net	9,448	1,012	1,075
Restaurant closure charges	0	(449)	(379)
Other Noncash Income	0	(523)	0
Changes in operating assets and liabilities:
Accounts and other receivables, net	(349)	616	313
Inventories	(191)	(220)	6
Prepaid expenses and other current assets	(732)	1,949	(2,580)
Other assets	(273)	(125)	(162)
Accounts payable	(271)	2	2,332
Increase (Decrease) in Operating Lease Liabilities	(18,846)	0	0
Other accrued liabilities	(1,308)	(488)	(1,526)
Other non-current liabilities	973	3,647	2,856
Net cash provided by operating activities	49,045	61,832	57,788
Investing activities
Purchases of property and equipment	(43,696)	(48,032)	(50,627)
Proceeds from disposal of property and equipment, net	14,107	1,323	9,907
Purchases of other assets	(2,039)	(1,474)	(1,033)
Acquisition of franchisees	(4,832)	(1,841)	(1,128)
Proceeds from Divestiture of Businesses	7,187	0	2,192
Net cash used in investing activities	(29,273)	(50,024)	(40,689)
Financing activities
Proceeds from deemed landlord financing liabilities	0	2,675	3,925
Repurchase of common stock and warrants	(7,373)	(16,316)	(13,849)
Payment of tax withholding related to restricted stock vesting, option exercises and distribution of restricted stock units	(2,602)	(2,378)	(1,923)
Payments on finance leases, other debt and deemed landlord financing	(635)	(1,417)	(1,587)
Proceeds from revolving credit facility	41,000	31,000	31,500
Payments on revolving credit facility	(55,000)	(25,000)	(37,500)
Payments of Debt Issuance Costs	(1,014)	0	0
Proceeds from Stock Options Exercised	120	222	99
Net cash used in financing activities	(25,504)	(11,214)	(19,335)
(Decrease) increase in cash and cash equivalents	(5,732)	594	(2,236)
Cash and cash equivalents at beginning of period	7,153	6,559	8,795
Cash and cash equivalents at end of period	1,421	7,153	6,559
Supplemental cash flow information:
Interest Paid, Excluding Capitalized Interest, Operating Activities	6,919	8,823	6,873
Cash paid during the period for income taxes, net of tax refunds	3,856	3,061	9,441
Supplemental schedule of non-cash activities:
Accrued property and equipment purchases	5,729	5,691	5,134
Write-offs against bad debt reserves	30	26	0
Amortization of interest rate cap into net income, net of tax	132	44	4
Change in other asset for fair value of interest rate cap recorded to other comprehensive (loss) income, net of tax	(364)	122	(162)
Operating Lease, Right-of-Use Asset	298,942	0	0
Finance Lease, Right-of-Use Asset	1,185	0	0
Impairment of Operating Lease, Right-of-Use Asset	$ 3,116	$ 0	$ 0