Commitments And Contingencies (Details) (USD $)	9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Oct. 31, 2008
Commitments And Contingencies [Line Items]
Potential future milestone and other contingency payments	$ 93,800,000
Contingency payments expected to be paid in next twelve months	7,800,000
Minimum purchase commitments	87,100,000
Commitments associated with capital investments pen device	8,400,000
Borrowing limit under Line of Credit and Cash Collateral Agreement			165,000,000
Cash collateral issued to lender	15,000,000	15,000,000
Standby Letters of Credit [Member]
Commitments And Contingencies [Line Items]
Line of credit facility amount issued	10,500,000
BYDUREON [Member]
Commitments And Contingencies [Line Items]
Minimum purchase commitments	37,800,000
Bank Of America [Member]
Commitments And Contingencies [Line Items]
Borrowing limit under Line of Credit and Cash Collateral Agreement		$ 15,000,000