Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements of Operations [Abstract]
Revenue	$ 131	$ 214
Operating expenses:
Research and development	2,560	3,350
Selling, general and administrative	1,716	1,903
Restructuring	35	228
Total operating expenses	4,311	5,481
Loss from operations	(4,180)	(5,267)
Other income (expense):
Interest and other expense	(914)
Change in fair value liability for price adjustable warrants and subscription investment units	270	1,602
Total other income (expense), net	(644)	1,602
Net loss	$ (4,824)	$ (3,665)
Net loss per common share - basic and diluted	$ (0.45)	$ (1.18)
Shares used in computing net loss per share - basic and diluted	10,700	3,109