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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jan. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Decrease in liability as a result of decreasing the profit element and risk premium input by 100 basis points | $ 500 |  |  |
Increase in liability as a result of decreasing the discount rate by 100 basis points | 2,800 |  |  |
Decrease in liability as a result of increasing the discount rate by 100 basis points | 3,100 |  |  |
Debt Securities, One |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in debt securities |  |  |  | $ 25,000
Debt Securities, Two |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in debt securities |  |  | $ 13,000 |
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 | 534,000 |  |  |
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 | 592,700 |  |  |
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 | $ 245,900 |  |  |

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References No definition available. + Details
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