STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended		150 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011
Revenues
Operating expenses:
Research and development	2,025	1,542	3,252	3,399	36,748
General and administrative expenses	883	699	1,713	1,983	23,927
Loss from operations	(2,908)	(2,241)	(4,965)	(5,382)	(60,675)
Other (expense) income:
Dividend, interest and other income		1		1	1,885
Interest expense-related parties	(1,366)		(2,734)		(3,600)
Change in estimated fair value of derivative financial instruments - warrants	1,323	(2,232)	2,666	(2,588)	(569)
Other (expense) income, net	(43)	(2,231)	(68)	(2,587)	(2,284)
Net loss	(2,951)	(4,472)	(5,033)	(7,969)	(62,959)
Preferred stock dividends	(845)	(787)	(1,673)	(1,558)
Net loss applicable to common stock	$ (3,796)	$ (5,259)	$ (6,706)	$ (9,527)
Net loss applicable to common stock per share, basic and diluted	$ (0.14)	$ (0.19)	$ (0.24)	$ (0.34)
Weighted average common shares outstanding, basic and diluted	27,996,827	27,865,010	27,997,261	27,865,010