COMMITMENTS AND CONTINGENCIES - Off-Balance Sheet Arrangements (Details) - Operating agreement - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2018
Loss Contingencies [Line Items]
Fair value of Minimum Sales Guarantee			$ 0.1
MSG, Upfront payment	$ 0.1
Minimum
Loss Contingencies [Line Items]
Supply commitments		$ 6.0