Quarterly report pursuant to Section 13 or 15(d)

Convertible Senior Notes - Notes Payable (Details)

v3.20.2
Convertible Senior Notes - Notes Payable (Details) - Convertible Notes - 2023 Convertible Senior Notes - USD ($)
Sep. 30, 2020
Dec. 31, 2019
May 31, 2018
Notes Payable, Current and Noncurrent [Abstract]      
Principal amount of the 2023 Notes outstanding $ 515,560,000 $ 750,000,000 $ 750,000,000.0
Unamortized discount (including unamortized debt issuance cost) (60,587,000) (111,041,000)  
Total long-term portion of notes payable 454,973,000 638,959,000  
Carrying value of equity component of the 2023 Notes 55,339,000 101,422,000  
Fair value of the 2023 Notes outstanding (Level 2) $ 464,958,000 $ 647,280,000