CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues
Interest income	$ 1	$ 2	$ 3	$ 7
Total revenues and other income	1	2	3	7
Expenses
Research and development	5,506	6,276	19,277	21,336
General and administrative	1,100	1,277	3,647	3,759
Total expenses	6,606	7,553	22,924	25,095
Net loss	$ (6,605)	$ (7,551)	$ (22,921)	$ (25,088)
Loss per share - basic and diluted:	$ (0.27)	$ (0.32)	$ (0.94)	$ (1.08)
Weighted average shares used in loss per share calculation:
Basic	24,318	23,347	24,291	23,162
Diluted	24,318	23,347	24,291	23,162