Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

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

Summary of Stock-Based Compensation Expense

Stock-based compensation expense included within “Total operating costs and expenses” for the three months ended March 31, 2016 and 2015 was as follows:

	Three Months Ended March 31,
	2016		2015
Cost of product sales	$	27	$	—
Research and development	381		433
Selling, general and administrative	2,769		2,029
Total stock-based compensation	$	3,177	$	2,462