Stock-Based Awards (Tables)

3 Months Ended

Mar. 31, 2016

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

Summary of Stock-Based Compensation Expense Related to Stock Options and Restricted Common Stock

The Company recorded stock-based compensation expense related to stock options and restricted common stock in the following expense categories within its consolidated statements of operations:

	Three Months Ended March 31,
	2016		2015
	(in thousands)
Research and development	$	828	$	404
General and administrative		1,928		653
	$	2,756	$	1,057