OPERATING LEASES - Lease cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OPERATING LEASES
Operating lease cost	$ 1,990	$ 1,995	$ 2,158
Variable lease cost	179	164	188
Total net lease cost	$ 2,169	$ 2,159	$ 2,346