Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2019	Mar. 27, 2018
Operating activities
Net income	$ 1,425	$ 3,229
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,907	5,914
Amortization of favorable and unfavorable lease assets and liabilities, net	0	(118)
Amortization of deferred financing costs, debt discount and interest rate cap	118	95
Amortization of operating lease assets	4,963	0
Stock-based compensation	1,577	1,274
Impairment of long-lived assets	0	0
Deferred income taxes	196	266
Loss on disposal of assets, net	290	93
Restaurant closure charges	118	33
Changes in operating assets and liabilities:
Accounts and other receivables, net	(48)	1,017
Inventories	259	(27)
Prepaid expenses and other current assets	2,297	3,568
Other assets	(18)	(16)
Accounts payable	(1,317)	(2,609)
Operating lease liabilities	(4,695)	0
Other accrued liabilities	(1,051)	(973)
Other non-current liabilities	(118)	654
Net cash provided by operating activities	9,903	12,400
Investing activities
Purchases of property and equipment	(7,007)	(9,594)
Proceeds from disposal of property and equipment, net	10,040	573
Purchases of other assets	(515)	(474)
Acquisition of franchisees	(3,120)	0
Proceeds from sale of company-operated restaurants	2,090	0
Net cash used in investing activities	1,488	(9,495)
Financing activities
Repurchase of common stock and warrants	(4,306)	(33)
Payment of tax withholding related to restricted stock vesting	(84)	(79)
Payments on finance leases, other debt and deemed landlord financing	(146)	(362)
Proceeds from revolving credit facility	9,000	5,000
Payments on revolving credit facility	(14,000)	(4,000)
Proceeds from exercise of stock options	16	48
Net cash used in financing activities	(9,520)	574
Increase (decrease) in cash and cash equivalents	1,871	3,479
Cash and cash equivalents at beginning of period	7,153	6,559
Cash and cash equivalents at end of period	9,024	10,038
Supplemental cash flow information:
Cash paid during the period for interest	1,134	1,377
Cash paid during the period for income taxes	0	0
Supplemental schedule of non-cash activities:
Accrued property and equipment purchases	4,342	(1,492)
Write-offs of accounts receivables	0	6
Reclassification of interest rate cap amortization included in net income	21	6
Change in other asset for fair value of interest rate cap recorded to other comprehensive (loss) income, net of tax	(139)	174
Operating lease right-of-use assets obtained in exchange for lease obligations	240,160	0
Finance lease right-of-use assets obtained in exchange for lease obligations	1,185	0
Impairment on operating lease right-of-use assets related to the adoption of new accounting pronouncement	$ 3,116	$ 0