EMPLOYEE BENEFIT PLANS - Pension Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning balance	$ 6,057	$ 5,259
Service cost	272	252	$ 227
Interest cost	20	37	78
Actuarial losses	233	159
Benefits paid	(94)	(173)
Foreign currency translation adjustment	(485)	523
Projected benefit obligation, ending balance	6,003	6,057	$ 5,259
Current portion (included in “Accrued and other current liabilities”)
Defined Benefit Plan Disclosure [Line Items]
Current portion (included in “Accrued and other current liabilities”)	32	47
Long-term portion (included in “Other non-current liabilities”)
Defined Benefit Plan Disclosure [Line Items]
Long-term portion (included in “Other non-current liabilities”)	$ 5,971	$ 6,010