Condensed Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Operating costs and expenses(1) :
Research and development	$ 1,098	$ 2,379	$ 4,280	$ 9,912
General and administrative	1,309	1,256	4,095	4,637
Restructuring	1,146		1,146	510
Total operating costs and expenses	3,553	3,635	9,521	15,059
Loss from operations	(3,553)	(3,635)	(9,521)	(15,059)
Change in fair value of warrants and other financial instruments	40	(9,893)	2,219	(6,987)
Investment income	1	3	3	14
Other (expense) income, net	(1)	(11)	(9)	5
Net loss	(3,513)	(13,536)	(7,308)	(22,027)
Basic and diluted net loss per share	$ (0.25)	$ (3.47)	$ (0.74)	$ (6.24)
Weighted-average number of common shares outstanding - Basic and diluted	13,969	3,896	9,870	3,530
(1) Includes share based compensation expense as follows :
Total share based compensation expense	64	176	550	650
Research and development
(1) Includes share based compensation expense as follows :
Total share based compensation expense	5	62	171	109
General and administrative
(1) Includes share based compensation expense as follows :
Total share based compensation expense	$ 59	$ 114	$ 379	$ 541