Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2017

Accumulated Other Comprehensive Income

Summary of changes in accumulated other comprehensive income

	Unrealized Gain (Loss) on Marketable Securities			Foreign Currency Items		Total
	(In thousands)
Balance at December 31, 2016	$	(55	)	$	2,596	$	2,541
Other comprehensive gain		23			—		23
Balance at December 31, 2017	$	(32	)	$	2,596	$	2,564