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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 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 | 9,800 |  |  |  |
Decrease in liability as a result of increasing the discount rate by 100 basis points | 11,100 |  |  |  |
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 | 480,800 |  |  |  |
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 | 545,200 |  |  |  |
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 | $ 218,100 |  |  |  |

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