CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flow from operating activities
Net loss	$ (6,674)	$ (4,856)
Adjustments to reconcile net loss to net cash used in operating activities
Amortization	121	120
Depreciation	198	185
Stock-based compensation	416	675
Change in fair value of warrant liability	0	(2,374)
Loss on extinguishment of warrant liability	0	440
(Increase) decrease in assets
Prepaid drug product for testing	860	(277)
Other current assets	72	391
Increase (decrease) in liabilities
Accounts payable and accrued expenses	166	(36)
Net cash used in operating activities	(4,841)	(5,732)
Cash flow from investing activities
Purchases of furniture, fixtures & equipment	(17)	(538)
Net cash used in investing activities	(17)	(538)
Cash flow from financing activities
Net proceeds from sale of common stock	1,179	0
Net proceeds from exercise of warrants	0	1,518
Net cash provided by financing activities	1,179	1,518
Net decrease in cash	(3,679)	(4,752)
Cash, beginning of period	5,965	9,375
Cash, end of period	2,286	4,623
Non-cash financing activities
Warrants transferred to equity upon modification	0	797
Conversion of warrant liability to equity	$ 0	$ 175