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DEBT - Future Payments of Principal and Contractual Interest (Details) - Convertible debt - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Principal
Remainder of 2021	$ 0
2022	0
2023	0
2024	0
2025	600,000
Principal, total due	600,000	$ 600,000
Interest
Remainder of 2021	0
2022	4,500
2023	4,500
2024	4,500
2025	1,488
Interest expense, total due	14,988
Total
Remainder of 2021	0
2022	4,500
2023	4,500
2024	4,500
2025	601,488
Principal and interest, total due	$ 614,988

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