Other Assets (Tables)

12 Months Ended

Dec. 31, 2018

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Summary of Other Assets

	December 31,
	2017		2018
	(in thousands)
Restricted cash and cash equivalents	$	1,255	$	1,003
Pension asset		2,593		1,898
Other		995		1,210
Total	$	4,843	$	4,111