Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ (4,548)	$ 6,599
Net income (loss) from discontinued operations	(24)	11,740
Net loss from continuing operations	(4,524)	(5,141)
Adjustments to reconcile net income (loss) to net cash used in operating activities from continuing operations:
Depreciation and amortization	23	77
Non-cash interest expense	0	56
Stock-based compensation expense	556	572
Warrant liabilities revaluation	(222)	292
Loss on debt extinguishment	0	422
Amendment of equity classified warrants	158	0
Changes in operating assets and liabilities from continuing operations:
Prepaid expenses and other current assets	(33)	(145)
Other assets	(1)	14
Accounts payable	996	(547)
Accrued expenses	(294)	(478)
Accrued compensation	(489)	43
Deferred revenue	(12)	0
Other liabilities	(23)	(16)
Net cash used in operating activities from continuing operations	(3,865)	(4,851)
Cash flows from financing activities from continuing operations:
Proceeds from exercise of warrants	1,275	0
Issuance of common stock and warrants	3,550	6,866
Issuance costs related to common stock and warrants	(452)	(788)
Repayment of notes payable	0	(7,129)
Net cash provided by (used in) financing activities from continuing operations	4,373	(1,051)
Cash flows from discontinued operations:
Net cash used in operating activities of discontinued operations	(3)	(114)
Net cash provided by investing activities of discontinued operations	0	11,750
Net cash provided by (used in) discontinued operations	(3)	11,636
Net increase in cash	505	5,734
Cash, beginning of period	6,331	2,087
Cash, end of period	6,836	7,821
Supplemental disclosure of cash flow information:
Cash paid for interest	0	92
Non-cash investing and financing activities:
Accrued transaction costs for financing activities	(98)	(135)
Issuance of placement agent warrants	105	176
Reclassification of warrant liabilities to equity	$ 472	$ 798