Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 16, 2020	Jun. 18, 2019
Operating activities
Net (loss) income	$ (103,044,000)	$ 3,517,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Allowance for doubtful accounts	15,000	0
Depreciation and amortization	12,422,000	11,720,000
Amortization of deferred financing costs, debt discount and interest rate cap	190,000	244,000
Amortization of operating lease assets	10,155,000	9,915,000
Stock-based compensation	2,638,000	3,254,000
Impairment of goodwill	87,277,000	0
Impairment of trademarks	11,900,000	0
Impairment of long-lived assets	8,287,000	3,694,000
Deferred income taxes	(10,377,000)	(138,000)
Loss on disposal of assets and adjustments to assets held for sale, net	557,000	884,000
Restaurant closure charges	42,000	118,000
Changes in operating assets and liabilities:
Accounts and other receivables, net	(444,000)	904,000
Inventories	652,000	101,000
Prepaid expenses and other current assets	2,685,000	1,003,000
Other assets	(174,000)	(67,000)
Accounts payable	4,000	543,000
Operating lease liabilities	(9,658,000)	(9,316,000)
Other accrued liabilities	9,216,000	(1,446,000)
Other non-current liabilities	(882,000)	865,000
Net cash provided by operating activities	21,461,000	25,795,000
Investing activities
Purchases of property and equipment	(13,794,000)	(17,895,000)
Proceeds from disposal of property and equipment, net	1,440,000	12,696,000
Purchases of other assets	(829,000)	(776,000)
Acquisition of franchisees	0	(3,120,000)
Proceeds from sale of company-operated restaurants	1,266,000	2,090,000
Net cash used in investing activities	(11,917,000)	(7,005,000)
Financing activities
Repurchase of common stock and warrants	0	(7,373,000)
Payment of tax withholding related to restricted stock vesting	(105,000)	(84,000)
Payments on finance leases and other debt	(111,000)	(267,000)
Proceeds from revolving credit facility	65,000,000	14,000,000
Payments on revolving credit facility	(65,000,000)	(27,000,000)
Proceeds from exercise of stock options	0	31,000
Net cash used in financing activities	(216,000)	(20,693,000)
Increase (decrease) in cash and cash equivalents	9,328,000	(1,903,000)
Cash and cash equivalents at beginning of period	1,421,000	7,153,000
Cash and cash equivalents at end of period	10,749,000	5,250,000
Supplemental cash flow information:
Cash paid during the period for interest	2,336,000	3,008,000
Cash paid during the period for income taxes	0	1,764,000
Supplemental schedule of non-cash activities:
Accrued property and equipment purchases	1,586,000	5,939,000
Write-offs of accounts receivables	0	21,000
Amortization of interest rate cap into net income, net of tax	52,000	47,000
Change in other asset for fair value of interest rate cap recorded to other comprehensive (loss) income, net of tax	0	(270,000)
Operating lease right-of-use assets obtained in exchange for lease obligations	10,249,000	252,440,000
Finance lease right-of-use assets obtained in exchange for lease obligations	0	1,185,000
Impairment on operating lease right-of-use assets related to the adoption of new accounting pronouncements	$ 0	$ 3,116,000