STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Expenses:
Research and development	$ 3,573	$ 5,494
General and administrative	1,812	1,604
Loss from operations	(5,385)	(7,098)
Interest income	40	22
Interest expense	(84)	(124)
Other expense	(9)	(16)
Net loss	$ (5,438)	$ (7,216)
Per share information:
Net loss per share of common stock-basic and diluted (in dollars per share)	$ (0.26)	$ (0.37)
Basic and diluted weighted average shares outstanding (in shares)	20,580,558	19,464,669