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Convertible Senior Notes (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Carrying Values and Coupon Rates on Financing Arrangements
The following table summarizes information about the 2023 Notes (in thousands):
March 31, 2021December 31, 2020
Principal amount of the 2023 Notes outstanding$390,780 $495,280 
Unamortized discount (including unamortized debt issuance cost)(38,467)(52,987)
Total long-term portion of notes payable$352,313 $442,293 
Carrying value of equity component of the 2023 Notes$35,135 $48,397 
Fair value of the 2023 Notes outstanding (Level 2)$404,477 $466,053