CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 13,254	$ (29,271)	$ (5,924)
Other comprehensive income (loss):
Adjustment to pension benefit plan	(233)	(159)	(206)
Change in foreign currency translation adjustments:
Translation gain (loss)	(8,022)	8,279	(1,437)
Loss reclassified into earnings	0	0	56
Total change in foreign currency translation adjustments	(8,022)	8,279	(1,381)
Other comprehensive income (loss) before tax	(8,255)	8,120	(1,587)
Provision for (benefit from) income taxes	873	(801)	262
Other comprehensive income (loss), net of tax	(9,128)	8,921	(1,849)
Total comprehensive income (loss)	$ 4,126	$ (20,350)	$ (7,773)