Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net (loss) income	$ (9,242)	$ 321
Net income (loss) from discontinued operations	(24)	12,070
Net loss from continuing operations	(9,218)	(11,749)
Adjustments to reconcile net loss to net cash used in operating activities from continuing operations:
Depreciation and amortization	41	117
Non-cash interest expense	0	56
Stock-based compensation expense	1,301	1,138
Warrant liabilities revaluation	(222)	646
Amendment of equity classified warrants	293	0
Loss on debt extinguishment	0	422
Other	0	2
Changes in operating assets and liabilities from continuing operations:
Prepaid expenses and other current assets	155	(84)
Other assets	(2)	25
Accounts payable	177	(705)
Accrued expenses	(6)	(681)
Accrued compensation	(591)	249
Deferred revenue	(12)	0
Other liabilities	(42)	(7)
Net cash used in operating activities from continuing operations	(8,126)	(10,571)
Cash flows from financing activities from continuing operations:
Issuance of common stock and warrants	4,792	10,733
Issuance costs related to common stock and warrants	(690)	(1,392)
Proceeds from exercise of warrants	1,275	289
Repayment of notes payable	0	(7,129)
Net cash provided by financing activities from continuing operations	5,377	2,501
Cash flows from discontinued operations:
Net cash (used in) provided by operating activities of discontinued operations	(3)	105
Net cash provided by investing activities of discontinued operations	0	12,209
Net cash provided by (used in) discontinued operations	(3)	12,314
Net (decrease) increase in cash	(2,752)	4,244
Cash, beginning of period	6,331	2,087
Cash, end of period	3,579	6,331
Supplemental disclosure of cash flow information:
Cash paid for interest	0	92
Cash paid for income taxes		0
Non-cash investing and financing activities:
Reclassification of warrant liabilities to equity	472	798
Issuance of placement agent warrants	$ 159	$ 287