Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation Expense

The following table shows total stock-based compensation expense included in the condensed consolidated statement of operations for the three month and nine months ended September 30, 2013 and 2012 (in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Costs and expenses:
Research and development	$	732	$	774	$	2,140	$	2,195
General and administrative		659		630		1,958		1,816
Total stock-based compensation expense	$	1,391	$	1,404	$	4,098	$	4,011