Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Operating Leases of Lessee Disclosure

The following table summarizes the contractual rent payments expected in future years: 

(In thousands)	2018		2019		2020		2021		2022		Thereafter		Total
Operating lease rental payments	$	307	$	293	$	258	$	259	$	116	$	—	$	1,233