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Accrued Expenses (Components Of Accrued Expenses) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Accrued Expenses [Abstract]
Clinical and preclinical trials	$ 25,663	$ 21,453
Payroll and payroll related	4,187	1,112
Accrued interest on Convertible Notes	226
Other professional services	3,812	1,449
Total	$ 33,888	$ 24,014

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. 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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- Definition

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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