LEASES - Undiscounted future lease payments for operating and finance leases (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating Leases
2020 (excluding the nine-months ended September 30, 2020)	$ 811
2021	3,573
2022	2,898
2023	2,185
2024	1,890
2025 and thereafter	13,188
Total lease payments	24,545
Less imputed interest	(4,028)
Total	20,517	$ 28,463
Finance Leases
2020 (excluding the nine-months ended September 30, 2020)	588
2021	633
Total lease payments	1,221
Less imputed interest	(7)
Total	$ 1,214	$ 1,485