STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Expenses:
Research and development	$ 5,494	$ 5,468
General and administrative	1,604	1,447
Loss from operations	(7,098)	(6,915)
Interest income	22	14
Interest expense	(124)	(116)
Other income (expense)	(16)	10
Net loss	$ (7,216)	$ (7,007)
Per share information:
Net loss per share of common stock-basic and diluted (in dollars per share)	$ (0.37)	$ (0.50)
Basic and diluted weighted average shares outstanding (in shares)	19,464,669	14,068,238