CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (4,647)	$ (4,128)	$ (58,351)
Other comprehensive income (loss), net of tax:
Change in foreign currency translation adjustments	330	(268)	302
Pension benefit plan	1,511	2,152	361
Total comprehensive income (loss)	$ (2,806)	$ (2,244)	$ (57,688)