COMMITMENTS AND CONTINGENCIES - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease costs	$ 769	$ 770	$ 1,538	$ 1,538
Finance lease costs	80	61	146	122
Total lease costs	$ 849	$ 831	$ 1,684	$ 1,660