COMMITMENTS AND CONTINGENCIES - Components of Lease Expense (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 1,874
Finance lease cost:
Amortization of right-of-use assets	1,210
Interest on lease liabilities	347
Total finance lease cost	1,557
Short-term lease cost	1,700
Variable lease cost	264
Total Lease Cost	$ 5,395