LEASES - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease cost	$ 2,193	$ 1,595	$ 1,764	[1]

[1] Operating lease cost for the year ended December 31, 2018 was prior to the adoption of ASU 2016-02, and was therefore in accordance with ASC Topic 840.