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FAIR VALUE MEASUREMENT AND FINANCIAL INSTRUMENTS - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Royalty rate 2.00%    
Change in fair value of contingent consideration $ 48,160 $ (53,700)  
Discount Rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Weighted-average cost of capital 780.00%    
Discount Rate | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Contingent consideration liability measurements used     0.084
Discount Rate | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Contingent consideration liability measurements used     0.088