Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]
Revenue	$ 1,106	$ 286	$ 2,895	$ 629
Operating expenses:
Research and development	753	2,955	4,506	9,077
Selling, general and administrative	598	1,852	3,306	6,503
Restructuring	1,446	1,104	1,481	1,390
Total operating expenses	2,797	5,911	9,293	16,970
Loss from operations	(1,691)	(5,625)	(6,398)	(16,341)
Other income (expense):
Interest and other expense	(201)		(2,466)
Change in fair value liability for price adjustable warrants and subscription investment units	50	1,238	3,278	4,704
Gain on settlement of liabilities, net	92		92
Total other income (expense), net	(59)	1,238	904	4,704
Net loss	$ (1,750)	$ (4,387)	$ (5,494)	$ (11,637)
Net loss per common share - basic and diluted	$ (0.12)	$ (0.55)	$ (0.44)	$ (2.22)
Shares used in computing net loss per share - basic and diluted	14,309	8,041	12,417	5,248