COMMITMENTS AND CONTINGENCIES - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 2,306	$ 1,820
Operating cash flows from finance leases	306	347
Financing cash flows from finance leases	680	672
Non-cash activities: right-of-use assets obtained in exchange for lease obligations:
Operating leases	3,100	2,109
Finance leases	$ 0	$ 672