STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended		98 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011
Research contract revenue	$ 200		$ 467		$ 467
Operating expenses:
Research and development, including costs of research contracts	10,667	5,711	44,433	9,872	116,249
General and administrative	3,742	2,789	11,017	8,313	64,828
Total operating expenses	14,409	8,500	55,450	18,185	181,077
Loss from operations	(14,209)	(8,500)	(54,983)	(18,185)	(180,610)
Other income, net	19	7	26	29	4,701
Change in fair value of warrants	13,388	(3,712)	4,423	(2,663)	1,561
Net income (loss)	$ (802)	$ (12,205)	$ (50,534)	$ (20,819)	$ (174,348)
Net income (loss) per share - basic	$ (0.01)	$ (0.26)	$ (0.77)	$ (0.48)
Net income (loss) per share - diluted	$ (0.01)	$ (0.26)	$ (0.77)	$ (0.48)
Weighted average common shares outstanding to compute net income (loss) per share - basic	68,104,934	47,426,991	65,277,084	43,333,663
Weighted average common shares outstanding to compute net income (loss) per share - diluted	68,104,934	47,426,991	65,277,084	43,333,663