Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Collaboration revenue - related party	$ 32,253	$ 1,982	$ 33,268	$ 5,715
Other revenue		656	36,068	1,967
Total revenues	32,253	2,638	69,336	7,682
Operating expenses:
Cost of revenues	509	595	2,302	1,731
Research and development	13,469	10,190	52,604	28,530
General and administrative	6,164	3,900	16,798	12,293
Intangible asset impairment	8,045		8,045
Total operating expenses	28,187	14,685	79,749	42,554
Income (loss) from operations	4,066	(12,047)	(10,413)	(34,872)
Other income, net	205	338	740	1,019
Income (loss) before income taxes	4,271	(11,709)	(9,673)	(33,853)
Income tax expense			(1)	(1)
Net income (loss)	4,271	(11,709)	(9,674)	(33,854)
Earnings (loss) per common share:
Basic	$ 0.03	$ (0.12)
Diluted	$ 0.03	$ (0.12)
Weighted average number of common shares outstanding:
Basic	124,770	96,133
Diluted	126,847	96,133
Basic and diluted net loss per common share		$ (0.12)	$ (0.09)	$ (0.39)
Shares used in computing basic and diluted net loss per common share			113,671	87,414
Comprehensive income (loss):
Net income (loss)	4,271	(11,709)	(9,674)	(33,854)
Changes in other comprehensive income:
Foreign currency translation adjustment	163	(386)	(89)	7
Comprehensive income (loss)	$ 4,434	$ (12,095)	$ (9,763)	$ (33,847)