CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating expenses
Research and development	$ 2,342	$ 1,583	$ 4,101	$ 4,089
General and administrative	740	893	2,579	2,708
Total operating expenses	3,082	2,476	6,680	6,797
Net operating loss	(3,082)	(2,476)	(6,680)	(6,797)
Other income (loss)
Change in fair value of warrant liability	0	0	0	2,374
Loss on extinguishment of warrant liability	0	0	0	(440)
Interest income	1	2	6	7
Total other income	1	2	6	1,941
Net loss	(3,081)	(2,474)	(6,674)	(4,856)
Deemed dividend related to warrant conversion	0	0	0	(1,038)
Net loss attributable to common stockholders	$ (3,081)	$ (2,474)	$ (6,674)	$ (5,894)
Net loss per share, basic and diluted	$ (0.27)	$ (0.25)	$ (0.59)	$ (0.60)
Basic and diluted weighted average number of common shares outstanding	11,469	10,006	11,384	9,810