Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock-Based Compensation Expense

Stock-based compensation expense included within “operating costs and expenses” for the three months ended March 31, 2015 and 2014 was as follows:

	Three Months Ended March 31,
	2015		2014
Research and development	$	433	$	444
Selling, general and administrative	2,029		2,407
Total stock-based compensation	$	2,462	$	2,851