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DEBT - Weighted-average assumptions used to compute fair-value (Details) - Convertible Senior Notes
Sep. 30, 2021
Measurement input - risk-free interest rate  
DEBT  
Measurement input 1.195
Measurement input - price volatility  
DEBT  
Measurement input 81.1
Measurement input - maturity period  
DEBT  
Maturity period (in years) 6 years 14 days