LEASES - Leases by Balance Sheet Location (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 25,402	$ 25,384
Operating lease liabilities, current	5,959	6,603
Operating lease liabilities, non-current	$ 21,640	$ 21,554