Restructuring (Tables)

12 Months Ended

Dec. 31, 2018

Restructuring [Abstract]

Restructuring and Related Costs

	Contract
	Termination Costs		Total Accrual
	(in thousands)
Balance at January 1, 2017	$	1,500	$	1,500
Charges to expense		—		—
Amounts paid		(1,500)		(1,500)
Balance at December 31, 2017	$	—	$	—