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DEBT - Future Payments of Principal and Contractual Interest (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Interest |  |
Interest expense, total due | $ 17,238 |
Convertible debt |  |
Principal |  |
2021 | 0 |
2022 | 0 |
2023 | 0 |
2024 | 0 |
2025 | 600,000 |
Principal, total due | 600,000 | $ 600,000
Interest |  |
2021 | 2,250 |
2022 | 4,500 |
2023 | 4,500 |
2024 | 4,500 |
2025 | 1,488 |
Total |  |
2021 | 2,250 |
2022 | 4,500 |
2023 | 4,500 |
2024 | 4,500 |
2025 | 601,488 |
Principal and interest, total due | $ 617,238 |

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