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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Jul. 31, 2023
Dec. 31, 2022
Sep. 30, 2021
Jan. 31, 2021
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 $ 1,200        
Decrease in liability as a result of decreasing the profit element and risk premium input by 100 basis points (1,200)        
Increase in liability as a result of decreasing the discount rate by 100 basis points (10,100)        
Decrease in liability as a result of increasing the discount rate by 100 basis points 10,900        
Privately-Held Company          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investments in debt securities         $ 25,000
Secured Convertible Promissory Notes          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investments in debt securities   $ 15,000   $ 13,000  
Non-Voting Debt Security          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investments in debt securities     $ 15,000    
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 511,800        
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 568,800        
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 $ 147,700