CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue	$ 0	$ 0	$ 0	$ 0
Operating expenses
Research and development	1,480	1,187	2,506	2,207
General and administrative	845	757	1,815	1,606
Total operating expenses	2,325	1,944	4,321	3,813
Net operating loss	(2,325)	(1,944)	(4,321)	(3,813)
Other income
Change in fair value of warrant liability	778	0	2,374	0
Loss on extinguishment of warrant liability	(440)	0	(440)	0
Interest income	2	2	5	4
Total other income	340	2	1,939	4
Net loss	(1,985)	(1,942)	(2,382)	(3,809)
Deemed dividend related to warrant conversion	(1,038)	0	(1,038)	0
Net loss attributable to common stockholders	$ (3,023)	$ (1,942)	$ (3,420)	$ (3,809)
Loss per share
Net loss per share, basic and diluted	$ (0.03)	$ (0.02)	$ (0.04)	$ (0.04)
Basic and diluted weighted average number of common shares outstanding	98,586	89,763	97,116	89,763