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Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Summary Of Equity and Liability Components of the Notes
The following table summarizes information about the net carrying amounts of the Notes as of December 31, 2020:
2024 Notes2026 Notes
Principal amount of Notes outstanding$13,750 $120,000 
Unamortized discount (including unamortized debt issuance cost)(2,619)(25,986)
Total notes payable$11,131 $94,014 

The following table summarizes information about the net carrying amounts of the 2024 notes as of December 31, 2019:
2024 Notes
Principal amount of Notes outstanding$80,000 
Unamortized discount (including unamortized debt issuance cost)(18,955)
Total notes payable$61,045 

The following table summarizes interest expense recognized on the Notes:
Year Ended December 31,
(in thousands)20202019
Contractual interest expense$4,026 $2,550 
Amortization of debt issuance costs and discount4,355 2,529 
Total notes payable$8,381 $5,079 
Schedule of Maturities of Long-term Debt
The following table summarizes the future principal payments for the Notes as of December 31, 2020 (in thousands):
2021$— 
2022— 
2023— 
202413,750 
2025— 
Thereafter120,000 
Total$133,750