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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Jan. 31, 2021 | Dec. 31, 2020
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 | $ 300 |  |
Decrease in liability as a result of decreasing the profit element and risk premium input by 100 basis points | 300 |  |
Increase in liability as a result of decreasing the discount rate by 100 basis points | 1,500 |  |
Decrease in liability as a result of increasing the discount rate by 100 basis points | 1,700 |  |
Level 2 | Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities | 0 |  | $ 0
Level 2 | Recurring | Convertible Notes | Convertible Senior Notes Due 2028 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes payable fair value | 538,300 |  |
Level 2 | Recurring | Convertible Notes | Convertible Senior Notes Due 2026 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes payable fair value | 596,100 |  |
Level 2 | Recurring | Convertible Notes | Convertible Senior Notes Due 2025 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes payable fair value | 218,700 |  |
Level 2 | Recurring | Convertible Notes | Convertible Senior Notes Due 2024 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes payable fair value | 9,100 |  |
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities |  | $ 25,000 |
Level 3 | Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities | $ 26,437 |  | $ 0

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity), investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) 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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