Statements Of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended		376 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011
Statements Of Operations
Revenues from license fees, grants and research contracts	$ 11,585	$ 3,997	$ 25,881	$ 5,201	$ 115,110
Operating expenses:
Research and development	17,750	6,931	32,551	13,020	298,955
General and administrative	3,960	4,733	8,986	7,577	97,388
Acquired in-process research and development					29,461
Operating loss	(10,125)	(7,667)	(15,656)	(15,396)	(310,694)
Other non-operating (loss) income:
Interest (expense) income and other, net	151	51	241	87	8,823
(Increase) decrease on warrant valuation	11,253	(9,040)	18,527	(1,931)	10,475
Realized gain on sale of short-term securities-available-for-sale					3,863
Write-down of short-term securities-available-for-sale					(17,001)
Total other non operating income	11,404	(8,989)	18,768	(1,844)	6,160
Net income (loss) and comprehensive income (loss)	$ 1,279	$ (16,656)	$ 3,112	$ (17,240)	$ (304,534)
Net income (loss) per share - basic	$ 0.01	$ (0.15)	$ 0.03	$ (0.16)
Net income (loss) per share - diluted	$ 0.01	$ (0.15)	$ 0.02	$ (0.16)
Weighted average number of common shares outstanding for computing basic income (loss) per share (in thousands)	134,090	110,383	123,346	110,404
Weighted average number of common shares outstanding for computing diluted income (loss) per share (in thousands)	138,916	110,383	130,018	110,404