CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		91 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013
Costs and Expenses:
Research and development	$ 9,055	$ 7,626	$ 23,399	$ 12,964	$ 81,106
Purchased in-process research and development					29,157
General and administrative	2,803	1,919	6,081	3,650	33,666
Loss from Operations	(11,858)	(9,545)	(29,480)	(16,614)	(143,929)
Interest and investment income	16	48	34	86	530
Interest expense					(12)
Other income		256		256	1,363
Change in fair value of derivative instruments-warrants	1,803	(1,317)	710	(1,309)	4,331
Total Other Income/(Expense)	1,819	(1,013)	744	(967)	6,212
Loss from Continuing Operations	(10,039)	(10,558)	(28,736)	(17,581)	(137,717)
Loss from discontinued operations					(72)
Net Loss	$ (10,039)	$ (10,558)	$ (28,736)	$ (17,581)	$ (137,789)
Weighted Average Common Shares Outstanding Basic and Diluted (in shares)	87,482,939	60,416,068	80,176,564	57,357,081
Net Loss per Common Share, Basic and Diluted
Net Loss per Common Share, Basic and Diluted (in dollars per share)	$ (0.11)	$ (0.17)	$ (0.36)	$ (0.31)