Sale of HIV Protease Inhibitor Royalty Stream (Details) (USD $) In Millions	12 Months Ended
Dec. 31, 2008	Jun. 30, 2011
Sale of HIV Protease Inhibitor Royalty Stream
Gross proceeds from sale of royalty rights receivable from GlaxoSmithKline	$ 160.0
Deferred revenues related to the one-time cash payment agreement with GlaxoSmithKline		$ 104.4

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