CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
License and other revenue		$ 131
Operating expenses:
Research and development	116	2,560
General and administrative	210	1,716
Restructuring		35
Total operating expenses	326	4,311
Loss from operations	(326)	(4,180)
Other income (expense):
Interest and other expense	(59)	(914)
Change in fair value liability for price adjustable warrants	2,042	270
Change in fair value of stock reserved for issuance to settle liabilities	377
Change in fair value of embedded features in notes payable and amendments to notes payable	272
Loss on debt extinguishment	(930)
Total other income (expense), net	1,702	(644)
Net income (loss)	$ 1,376	$ (4,824)
Net income (loss) per common share
Basic (in dollars per share)	$ 0.08	$ (0.45)
Diluted (in dollars per share)	$ 0.06	$ (0.45)
Shares used in computing net income (loss) per share
Basic (in shares)	16,938	10,700
Diluted (in shares)	24,286	10,700