Debt - Interest (Income) Expense, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest Expense [Abstract]
Interest under bank facilities	$ 313	$ 317	$ 315
Deferred financing cost amortization	168	168	168
Finance lease interest	520	639	877
Other	126	3	164
Interest income	(353)	(1,828)	(2,403)
Interest (income) expense, net	$ 774	$ (701)	$ (879)