LEASES - Lease expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
LEASES
Amortization of right-of-use assets	$ 597	$ 597	$ 704
Interest on lease liabilities	73	147	377
Operating lease cost	274	2,404	3,873
Short-term lease cost		200	84
Variable lease cost	1,665	1,306	1,375
Total lease cost	2,609	4,654	6,413
Rental expense	$ 5,100	$ 3,300	$ 5,200