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Debt - Equity and Liability Components of Financing Arrangements (Details) - Convertible Notes - 2023 Convertible Senior Notes - USD ($)	Dec. 31, 2022	May 31, 2018
Notes Payable, Current and Noncurrent
Principal amount of 2023 Notes outstanding	$ 76,854,000	$ 750,000,000
Unamortized discount (including unamortized debt issuance cost)	(159,000)
Total long-term portion of notes payable	76,695,000
Fair value of convertible senior notes outstanding (Level 2)	$ 74,789,000

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