LEASES - Right-of-Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets and Liabilities, Lessee [Abstract]
Operating Lease - ROU	$ 5,546	$ 7,338
Finance Leases - ROU	2,642	0
Total right-of-use assets	8,188	7,338
Operating leases liabilities - current	1,718	2,475
Finance leases liabilities - current	156	0
Total lease liabilities, current	1,874	2,475
Operating leases liabilities - non-current	3,500	4,827
Finance leases liabilities - non-current	2,526	0
Total lease liabilities, non-current	$ 6,026	$ 4,827