CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		144 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012
Operating expenses:
Research and development	$ 1,215	$ 1,291	$ 2,116	$ 2,035	$ 25,199
General and administrative	1,453	1,700	2,505	2,969	44,169
Total operating expenses	2,668	2,991	4,621	5,004	69,368
Total operating loss	(2,668)	(2,991)	(4,621)	(5,004)	(69,368)
Other income (expense):
Interest income	8	4	11	9	805
Interest expense					(4,451)
Change in fair value of convertible debt instrument					(3,426)
Change in fair value of warrant liabilities		(140)		(524)	9,022
Other income					491
Total other income (expense)	8	(136)	11	(515)	2,441
Net loss	(2,660)	(3,127)	(4,610)	(5,519)	(66,927)
Preferred stock dividends	(267)	(750)	(464)	(1,022)	(3,723)
Preferred stock accretion	(57)	(57)	(114)	(115)	(3,929)
Net loss applicable to common stockholders	$ (2,984)	$ (3,934)	$ (5,188)	$ (6,656)	$ (74,579)
Net loss per common share - basic and diluted	$ (0.19)	$ (0.34)	$ (0.36)	$ (0.59)
Weighted average common shares outstanding - basic and diluted	15,710	11,590	14,360	11,374