CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended		138 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011
Operating expenses:
Research and development	$ 3,552	$ 1,066	$ 23,083
General and administrative	6,857	3,817	41,664
Total operating expenses	10,409	4,883	64,747
Total operating loss	(10,409)	(4,883)	(64,747)
Other income (expense):
Interest income	18	6	794
Interest expense			(4,451)
Change in fair value of convertible debt instrument			(3,426)
Change in fair value of warrant liabilities	(524)	(1,241)	9,022
Other income		489	491
Total other income (expense)	(506)	(746)	2,430
Net loss	(10,915)	(5,629)	(62,317)
Preferred stock dividends	(1,568)	(902)	(3,259)
Preferred stock accretion	(230)	(2,178)	(3,815)
Net loss applicable to common stockholders	$ (12,713)	$ (8,709)	$ (69,391)
Basic and diluted net loss per share	$ (1.06)	$ (0.93)
Shares used in computing basic and diluted net loss per share	11,986	9,384