INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecognized Tax Benefits [Roll Forward]
Beginning of year balance	$ 255	$ 193	$ 185
Additions based on prior year tax positions	2	3	2
Additions based on current year tax positions	20	78	11
Reduction for prior year tax positions	0	(19)	(5)
Reductions for settlements	(165)	0	0
End of year balance	$ 112	$ 255	$ 193