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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Increase in liability as a result of increasing the profit element and risk premium input by 100 basis points $ 1,100  
Decrease in liability as a result of decreasing the profit element and risk premium input by 100 basis points (1,100)  
Increase in liability as a result of decreasing the discount rate by 100 basis points (10,400)  
Decrease in liability as a result of increasing the discount rate by 100 basis points 11,700  
Level 2 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in debt securities 0 $ 0
Level 2 | Recurring | Convertible Notes | Notes due 2028    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable fair value 492,300  
Level 2 | Recurring | Convertible Notes | Notes due 2026    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable fair value 579,800  
Level 2 | Recurring | Convertible Notes | Notes due 2025    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable fair value $ 154,300