Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2014

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 months ended March 31, 2014 and 2013 (in thousands):

	Three months ended March 31,
	2014		2013
Costs and expenses:
Research and development	$	1,073	$	685
General and administrative		834		644
Total stock-based compensation expense	$	1,907	$	1,329