Restructuring Costs (Tables)

9 Months Ended

Sep. 30, 2017

Restructuring and Related Activities [Abstract]

Summary of Restructuring Activities

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

	Contract Termination			Employee Termination			Total
	(in thousands)
Accrual balance at June 30, 2017	$	204		$	2		$	206
Adjustments to research and development expense		(38	)		—			(38	)
Cash payments		(56	)		(2	)		(58	)
Accrual balance at September 30, 2017	$	110		$	—		$	110

The following table summarizes restructuring activities for the nine months ended September 30, 2017:

	Contract Termination			Employee Termination			Total
	(in thousands)
Accrual balance at December 31, 2016	$	664		$	99		$	763
Adjustments to research and development expense		(112	)		—			(112	)
Cash payments		(442	)		(99	)		(541	)
Accrual balance at September 30, 2017	$	110		$	—		$	110