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Condensed Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue
Program fee revenue	$ 2,724	$ 2,724
Collaboration revenue	249	512
Total revenue	2,973	3,236
Operating expenses
Research and development	1,609	2,178
General and administrative	1,512	1,537
Total operating expenses	3,121	3,715
Operating loss	(148)	(479)
Interest income	178	272
Net income (loss)	$ 30	$ (207)
Net income (loss) per share, basic and diluted	$ 0.00	$ 0.00
Weighted-average shares used in computing net income (loss) per share:
Basic	44,732	43,124
Diluted	44,756	43,124

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