Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (8,505)	$ (15,939)	$ (12,698)	$ (6,040)
Other comprehensive (loss) income, net of tax:
Foreign currency translation (net of tax effect of $0 for all periods)	4,572	(2,988)	(446)	(1,046)
Retirement related benefit plans (net of tax effect of $0 for all periods)	(58)	132	110	376
Total other comprehensive income (loss)	4,514	(2,856)	(336)	(670)
Comprehensive loss	$ (3,991)	$ (18,795)	$ (13,034)	$ (6,710)