Restructuring Costs (Tables)

6 Months Ended

Jun. 30, 2017

Restructuring and Related Activities [Abstract]

Summary of Restructuring Activities

The following table summarizes restructuring activities for the three months ended June 30, 2017:

	Contract Termination			Employee Termination			Total
	(in thousands)
Accrual balance at March 31, 2017	$	489		$	6		$	495
Adjustments to research and development expense		(29	)		—			(29	)
Cash payments		(256	)		(4	)		(260	)
Accrual balance at June 30, 2017	$	204		$	2		$	206

The following table summarizes restructuring activities for the six months ended June 30, 2017:

	Contract Termination			Employee Termination			Total
	(in thousands)
Accrual balance at December 31, 2016	$	664		$	99		$	763
Adjustments to research and development expense		(74	)		—			(74	)
Cash payments		(386	)		(97	)		(483	)
Accrual balance at June 30, 2017	$	204		$	2		$	206