CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenue	$ 37	$ 13
Operating expense
Research and development	5,480	5,474
General and administrative	3,523	3,014
Total operating expense	9,003	8,488
Net operating loss	(8,966)	(8,475)
Other income (loss)
Change in fair value of warrant liability	2,374	1,713
Loss on extinguishment of warrant liability	(440)	0
Interest income	9	12
Total other income	1,943	1,725
Net loss	(7,023)	(6,750)
Loss per share
Deemed dividend related to warrant conversion	(1,038)	0
Net loss attributable to common stockholders	$ (8,061)	$ (6,750)
Net loss per share, basic and diluted	$ (0.8)	$ (0.73)
Basic and diluted weighted average number of common shares outstanding	10,081	9,270