Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended		150 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012
Operating expenses:
Research and development	$ 4,527	$ 3,552	$ 27,610
General and administrative	5,372	6,857	47,036
Total operating expenses	9,899	10,409	74,646
Total operating loss	(9,899)	(10,409)	(74,646)
Other income (expense):
Interest income	24	18	818
Interest expense			(4,451)
Change in fair value of convertible debt instrument			(3,426)
Change in fair value of warrant liabilities		(524)	9,022
Other income	200		691
Total other income (expense)	224	(506)	2,654
Net loss	(9,675)	(10,915)	(71,992)
Preferred stock dividends	(976)	(1,568)	(4,235)
Preferred stock accretion	(230)	(230)	(4,045)
Net loss applicable to common stockholders	$ (10,881)	$ (12,713)	$ (80,272)
Basic and diluted net loss per share	$ (0.72)	$ (1.06)
Shares used in computing basic and diluted net loss per share	15,131	11,986