CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Interest income	$ 1	$ 2	$ 2	$ 5
Total revenues and other income	1	2	2	5
Expenses
Research and development	6,450	7,491	13,771	15,060
General and administrative	1,342	1,256	2,547	2,482
Total expenses	7,792	8,747	16,318	17,542
Net loss	$ (7,791)	$ (8,745)	$ (16,316)	$ (17,537)
Loss per share - basic and diluted:	$ (0.32)	$ (0.38)	$ (0.67)	$ (0.76)
Weighted average shares used in loss per share calculation:
Basic	24,278	23,102	24,277	23,068
Diluted	24,278	23,102	24,277	23,068