Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2011

Accrued Expenses [Abstract]

Components Of Accrued Expenses

	December 31,
	2011		2010
Payroll and payroll related	$	1,112	$	617
Preclinical and clinical trials		21,453		19,190
Other		1,449		1,592
Total	$	24,014	$	21,399