Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2012

Accrued Expenses [Abstract]

Components Of Accrued Expenses

	March 31, 2012		December 31, 2011
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