CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue (including amounts from a related party of $1,430 in the three months ended March 31, 2012, and $2,456 in the three months ended March 31, 2011)	$ 127,099	$ 6,331
Operating expenses:
Research and development	33,202	20,464
General and administrative	7,857	7,169
Total operating expenses	41,059	27,633
Income (loss) from operations	86,040	(21,302)
Interest income	56	145
Interest expense	(1,502)	(1,510)
Net income (loss)	$ 84,594	$ (22,667)
Net income (loss) per share:
Basic (in dollars per share)	$ 1.01	$ (0.28)
Diluted (in dollars per share)	$ 0.93	$ (0.28)
Weighted-average number of shares used in per share calculations:
Basic (in shares)	83,590	80,854
Diluted (in shares)	92,080	80,854