STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Expenses:
Research and development	$ 4,840	$ 3,472	$ 17,593	$ 12,856
General and administrative	1,529	1,378	4,719	4,074
Loss from operations	(6,369)	(4,850)	(22,312)	(16,930)
Interest income	36	15	93	44
Interest expense	(118)	(121)	(365)	(353)
Other income (expense)	(13)	(7)	(44)	2
Net loss	$ (6,464)	$ (4,963)	$ (22,628)	$ (17,237)
Per share information:
Net loss per share of common stock-basic and diluted (in dollars per share)	$ (0.33)	$ (0.35)	$ (1.16)	$ (1.21)
Basic and diluted weighted average shares outstanding (in shares)	19,509,220	12,289,939	19,494,424	14,194,793