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FAIR VALUE MEASUREMENT AND FINANCIAL INSTRUMENTS - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]            
Contingent consideration liability, measurement input 0.084 0.118 0.145 0.179 0.084 0.118
License agreement, royalty rate 2.00%       2.00%  
Decrease in estimated fair value of contingent consideration $ (5,640) $ (18,400) $ (18,480) $ 53,700 $ 11,800  
Discount Rate            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Weighted-average cost of capital 8.80% 9.40% 13.20% 14.70% 8.80% 5.60%
Discount Rate | Minimum            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Contingent consideration liability, measurement input 0.084       0.084 0.056
Discount Rate | Maximum            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Contingent consideration liability, measurement input 0.088       0.088 0.118