Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended		162 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Operating expenses:
Research and development	$ 5,688	$ 4,527	$ 33,298
General and administrative	6,416	5,372	53,452
Total operating expenses	12,104	9,899	86,750
Total operating loss	(12,104)	(9,899)	(86,750)
Other income (expense):
Interest income	16	24	834
Interest expense			(4,451)
Change in fair value of convertible debt instrument			(3,426)
Change in fair value of warrant liabilities			9,022
Other income		200	691
Total other income (expense)	16	224	2,670
Net loss	(12,088)	(9,675)	(84,080)
Preferred stock dividends	(867)	(976)	(5,104)
Preferred stock accretion	(229)	(230)	(4,274)
Warrant modification	(8,763)		(8,763)
Net loss applicable to common stockholders	$ (21,947)	$ (10,881)	$ (102,221)
Basic and diluted net loss per share	$ (1.30)	$ (0.72)
Shares used in computing basic and diluted net loss per share	16,874	15,131