CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue	$ 0	$ 0	$ 0	$ 0
Operating expenses
Research and development	1,583	2,313	4,089	4,520
General and administrative	893	681	2,708	2,287
Total operating expenses	2,476	2,994	6,797	6,807
Net operating loss	(2,476)	(2,994)	(6,797)	(6,807)
Other income (loss)
Change in fair value of warrant liability	0	1,420	2,374	1,420
Loss on extinguishment of warrant liability	0	0	(440)	0
Interest income	2	4	7	8
Total other income	2	1,424	1,941	1,428
Net loss	(2,474)	(1,570)	(4,856)	(5,379)
Deemed dividend related to warrant conversion	0	0	(1,038)	0
Net loss attributable to common stockholders	$ (2,474)	$ (1,570)	$ (5,894)	$ (5,379)
Loss per share
Net loss per share, basic and diluted	$ (0.02)	$ (0.02)	$ (0.06)	$ (0.06)
Basic and diluted weighted average number of common shares outstanding	100,057	95,645	98,096	91,724