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Convertible Senior Notes (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Equity and Liability Components of the Convertible Senior Notes The following table summarizes information about the equity and liability components of the 2019 Notes and 2023 Notes (in thousands).
December 31, 2019December 31, 2018
Principle amount of 2019 Notes outstanding$—  $27,326  
Unamortized discount (including unamortized debt issuance cost)—  (893) 
Total current portion of notes payable$—  $26,433  
Principle amount of 2023 Notes outstanding$750,000  $750,000  
Unamortized discount (including unamortized debt issuance cost)(111,041) (140,136) 
Total long-term portion of notes payable$638,959  $609,864  
Carrying value of equity component of 2023 Notes$101,422  $127,997  
Fair value of convertible senior notes outstanding (Level 2)$647,280  $713,533