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Debt - Schedule of Convertible Notes (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	May 15, 2020
Liability component:
Total long-term debt outstanding	$ 712,010	$ 679,996
Convertible Senior Notes Due 2025
Liability component:
Total long-term debt outstanding	595,059	$ 568,744
Convertible Debt \| Convertible Senior Notes Due 2025
Liability component:
Principal	747,498
Unamortized debt discount and debt issuance costs	(152,439)
Total long-term debt outstanding	$ 595,059		$ 558,300

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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