Condensed Statements of Comprehensive Loss (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Condensed Statements of Comprehensive Loss [Abstract]
Product revenues	$ 114
Operating expenses:
Research and development	654	1,683
General and administrative	1,332	1,385
Restructuring (Note 2)	13
Total operating expenses	1,999	3,068
Loss from operations	(1,885)	(3,068)
Change in fair value of warrants	1	2,210
Investment income	5	1
Other (expense) income, net	(12)	(6)
Net loss	(1,891)	(863)
Comprehensive loss	$ (1,891)	$ (863)
Basic and diluted net loss per share	$ (0.12)	$ (0.13)
Weighted-average number of common shares outstanding	15,734	6,554

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