Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Jan. 02, 2018
Operating activities
Net income (loss)	$ 1,647	$ (8,441)	$ (37,482)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	22,086	22,872	24,613
Deferred income taxes, net	68	(283)	(228)
Restaurant impairments, closure costs and asset disposals	7,808	6,992	30,859
Loss on extinguishment of debt	746	626	0
Amortization of debt issuance costs	474	607	465
Stock-based compensation	2,443	2,979	1,514
Loss on liquidation of Canadian subsidiary	0	0	70
Gain on insurance proceeds received for property damage	(489)	(370)	0
Changes in operating assets and liabilities:
Accounts receivable	(630)	91	2,976
Inventories	(625)	(541)	(387)
Prepaid expenses and other assets	(690)	185	332
Accounts payable	406	(1,580)	(1,302)
Deferred rent	0	(1,396)	1,597
Operating lease assets and liabilities	(2,202)	0	0
Income taxes	82	(109)	180
Accrued expenses and other liabilities	(1,064)	(16,286)	(19,105)
Net cash provided by operating activities	30,060	5,346	4,102
Investing activities
Purchases of property and equipment	(17,404)	(14,338)	(20,828)
Franchise restaurant acquisition, net of cash acquired	(1,387)	0	0
Proceeds from disposal of property and equipment	352	0	0
Insurance proceeds received for property damage	0	500	0
Net cash used in investing activities	(18,439)	(13,838)	(20,828)
Financing activities
Net repayments from swing line loan	0	(101)	(96)
Proceeds from borrowings on long-term debt	1,917	74,889	10,532
Payments on long-term debt	(5,875)	(87,030)	(37,015)
Debt issuance costs	(917)	(1,713)	(938)
Payment of finance leases	(690)	0	0
Issuance of preferred stock and common stock warrants, net of transaction expenses	0	0	16,589
Issuance of common stock, net of transaction expenses	0	22,992	29,110
Stock plan transactions and tax withholding on share-based compensation awards	(252)	749	83
Net cash (used in) provided by financing activities	(5,817)	9,786	18,265
Effect of exchange rate changes on cash	0	0	(15)
Net increase in cash and cash equivalents	5,804	1,294	1,524
Cash and cash equivalents
Beginning of year	4,655	3,361	1,837
End of year	$ 10,459	$ 4,655	$ 3,361