CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flow from operating activities
Net loss	$ (3,593)	$ (2,382)
Adjustments to reconcile net loss to net cash used in operating activities
Amortization	80	80
Depreciation	132	108
Stock-based compensation	263	507
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	(215)	(216)
Other current assets	(251)	(109)
Increase (decrease) in liabilities
Accounts payable and accrued expenses	214	(257)
Net cash used in operating activities	(3,370)	(4,203)
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 exercise of warrants	0	1,548
Net cash provided by financing activities	0	1,548
Net decrease in cash	(3,387)	(3,193)
Cash, beginning of period	5,965	9,375
Cash, end of period	2,578	6,182
Non-cash financing activities
Warrants transferred to equity upon modification	0	797
Conversion of warrant liability to equity	0	175
Offering expenses included in accrued expenses	$ 0	$ 30