Quarterly report pursuant to Section 13 or 15(d)

Convertible Senior Notes - Notes Payable (Details)

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Convertible Senior Notes - Notes Payable (Details) - Convertible Notes - 2023 Convertible Senior Notes - USD ($)
Mar. 31, 2022
Dec. 31, 2021
May 31, 2018
Notes Payable, Current and Noncurrent [Abstract]      
Principal amount of the 2023 Notes outstanding $ 177,527,000 $ 343,301,000 $ 750,000,000
Unamortized discount (including unamortized debt issuance cost) (987,000) (22,584,000)  
Total long-term portion of notes payable 176,540,000 320,717,000  
Fair value of the 2023 Notes outstanding (Level 2) $ 172,535,000 $ 341,801,000