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Accrued Expenses (Components Of Accrued Expenses) (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Accounts Payable And Accrued Liabilities Current And Noncurrent [Line Items]    
Clinical and preclinical trials $ 29,172 $ 21,453
Payroll and payroll-related 8,450 1,112
Other professional services 7,322 1,449
Accrued interest on Convertible Notes 1,924  
Total $ 46,868 $ 24,014