STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Expenses:
Research and development	$ 3,915	$ 2,805	$ 9,384	$ 4,954
General and administrative	1,255	458	2,696	974
Loss from operations	(5,170)	(3,263)	(12,080)	(5,928)
Change in fair value of warrant liability		(31)		397
Interest income	15	1	28	5
Interest expense	(117)	(29)	(232)	(32)
Other income (expense)	(1)		9
Net loss	(5,273)	(3,322)	(12,275)	(5,558)
Cumulative preferred stock dividends		(1,103)		(2,173)
Net loss applicable to common stockholders	$ (5,273)	$ (4,425)	$ (12,275)	$ (7,731)
Per share information:
Net loss per share of common stock-basic and diluted (in dollars per share)	$ (0.37)	$ (7.98)	$ (0.87)	$ (15.14)
Basic and diluted weighted average shares outstanding (in shares)	14,223,739	554,126	14,146,431	510,559