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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]          
Intangible asset impairment charge         $ 0
Finite-lived intangible assets, gross     $ 1,042,808,000 $ 958,012,000  
Finite-lived intangible assets, accumulated amortization     198,397,000 110,889,000  
Goodwill, impairment loss     $ 0 0 $ 0
In Process Research and Development [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible asset impairment charge $ 20,200,000        
In Process Research and Development [Member] | Armune Biosciences Agreement          
Finite-Lived Intangible Assets [Line Items]          
Intangible asset impairment charge       $ 9,700,000  
Finite-lived intangible assets, gross   $ 12,200,000      
Finite-lived intangible assets, accumulated amortization   2,500,000      
In Process Research and Development [Member] | Biocartis Agreement          
Finite-Lived Intangible Assets [Line Items]          
Intangible asset impairment charge   $ 200,000,000