STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Expenses:
Research and development	$ 7,258	$ 3,915	$ 12,752	$ 9,384
General and administrative	1,586	1,255	3,190	2,696
Loss from operations	(8,844)	(5,170)	(15,942)	(12,080)
Interest income	34	15	56	28
Interest expense	(124)	(117)	(248)	(232)
Other income (expense)	(15)	(1)	(31)	9
Net loss	$ (8,949)	$ (5,273)	$ (16,165)	$ (12,275)
Per share information:
Net loss per share of common stock-basic and diluted (in dollars per share)	$ (0.46)	$ (0.37)	$ (0.83)	$ (0.87)
Basic and diluted weighted average shares outstanding (in shares)	19,509,220	14,223,739	19,486,944	14,146,431