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Convertible Senior Notes - Equity and Liability Components of Financing Arrangements (Details) - Convertible Notes - 2023 Convertible Senior Notes - USD ($)	Dec. 31, 2021	Dec. 31, 2020	May 22, 2018
Notes Payable, Current and Noncurrent
Principal amount of 2023 Notes outstanding	$ 343,301,000	$ 495,280,000	$ 750,000,000
Unamortized discount (including unamortized debt issuance cost)	(22,584,000)	(52,987,000)
Total long-term portion of notes payable	320,717,000	442,293,000
Carrying value of equity component of 2023 Notes	20,627,000	48,397,000
Fair value of convertible senior notes outstanding (Level 2)	$ 341,801,000	$ 466,053,000

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