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Debt - Convertible Senior Notes - Liability and Equity Components (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Liability component |  |
Principal | $ 433,484 | $ 433,484
Debt discount and issuance costs, net | (41,189) | (47,967)
Convertible senior notes | 2025 Notes |  |
Liability component |  |
Principal | 192,500 | 192,500
Debt discount and issuance costs, net | (40,420) | (46,766)
Net carrying amount | 152,080 | 145,734
Equity component, net | $ 65,361 | $ 65,361

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