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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Carrying Values and Coupon Rates on Financing Arrangements The following table summarizes information about the 2023 Notes (in thousands):
June 30, 2020December 31, 2019
Principal amount of the 2023 Notes outstanding$515,560  $750,000  
Unamortized discount (including unamortized debt issuance cost)(65,888) (111,041) 
Total long-term portion of notes payable$449,672  $638,959  
Carrying value of equity component of the 2023 Notes$60,181  $101,422  
Fair value of the 2023 Notes outstanding (Level 2)$452,167  $647,280