Restructuring Costs (Tables)

3 Months Ended

Mar. 31, 2018

Restructuring and Related Activities [Abstract]

Summary of Restructuring Activities

The following table summarizes restructuring activities for the three months ended March 31, 2018:

	Contract Termination
	(in thousands)
Accrual balance at December 31, 2017	$	137
Cash payments		(38	)
Accrual balance at March 31, 2018	$	99