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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Indefinite-lived Intangible Assets [Line Items]          
Impairment charge       $ 0 $ 261,929,000
Goodwill, impairment loss $ 0        
Licensing Agreements          
Indefinite-lived Intangible Assets [Line Items]          
Impairment charge 246,000,000 $ 11,800,000 $ 4,100,000    
Impairment charge, net of tax $ 180,400,000 $ 8,700,000 $ 3,000,000