Condensed Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Revenue
Program fee revenue	$ 1,958	$ 2,724
Collaboration revenue		249
Total revenue	1,958	2,973
Operating expenses
Research and development	1,183	1,609
General and administrative	1,218	1,512
Total operating expenses	2,401	3,121
Operating loss	(443)	(148)
Interest income	35	178
Net income (loss)	$ (408)	$ 30
Net income (loss) per share, basic and diluted	$ (0.01)	$ 0.00
Weighted-average shares used in computing net income (loss) per share:
Basic	44,932	44,732
Diluted	44,932	44,756

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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