LEASES - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease expense	$ 72	$ 492	$ 544	$ 1,195
Short-term lease expense	54	67	159	231
Less: Sublease income	0	(94)	0	(172)
Lease expense	$ 126	$ 465	$ 703	$ 1,254