CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating expenses
Research and development	$ 827	$ 1,480	$ 1,759	$ 2,506
General and administrative	852	845	1,839	1,815
Total operating expenses	1,679	2,325	3,598	4,321
Net operating loss	(1,679)	(2,325)	(3,598)	(4,321)
Other income (loss)
Change in fair value of warrant liability	0	778	0	2,374
Loss on extinguishment of warrant liability	0	(440)	0	(440)
Interest income	2	2	5	5
Total other income	2	340	5	1,939
Net loss	(1,677)	(1,985)	(3,593)	(2,382)
Deemed dividend related to warrant conversion	0	(1,038)	0	(1,038)
Net loss attributable to common stockholders	$ (1,677)	$ (3,023)	$ (3,593)	$ (3,420)
Net loss per share, basic and diluted	$ (0.15)	$ (0.31)	$ (0.32)	$ (0.35)
Basic and diluted weighted average number of common shares outstanding	11,341	9,859	11,341	9,712