LEASES - Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Weighted-average discount rate	5.80%
Weighted average remaining lease term in years	2 years 2 months 26 days
Operating lease cost	$ 6,018	$ 5,940	$ 5,935
Short term lease cost	138	180	196
Variable lease cost	54	16	6
Sublease income	(5,395)	(5,372)	(5,344)
Total	$ 815	$ 764	$ 793