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Accrued Expenses (Components Of Accrued Expenses) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accrued Liabilities Current [Line Items]
Clinical and preclinical trials	$ 28,473	$ 21,453
Payroll and payroll-related	14,537	1,112
Accrued professional services and other liabilities	7,155	1,449
Total	$ 50,165	$ 24,014

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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