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Convertible Senior Notes (Tables)
9 Months Ended
Sep. 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):
September 30, 2020December 31, 2019
Principal amount of the 2023 Notes outstanding$515,560 $750,000 
Unamortized discount (including unamortized debt issuance cost)(60,587)(111,041)
Total long-term portion of notes payable$454,973 $638,959 
Carrying value of equity component of the 2023 Notes$55,339 $101,422 
Fair value of the 2023 Notes outstanding (Level 2)$464,958 $647,280