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Debt (Tables)
 3 Months Ended
Mar. 31, 2021
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 March 31, 2021:
(in thousands)2024 Notes2026 Notes
Principal amount of notes outstanding$13,750 $120,000 
Unamortized discount (including unamortized debt issuance cost)(2,447)(24,984)
Total long-term portion of notes payable$11,303 $95,016 

The following table summarizes interest expense recognized on the Notes:
(in thousands)Three months ended March 31,
20212020
Contractual interest expense$(1,017)$(1,014)
Amortization of debt issuance costs and discount(1,174)(958)
Total interest expense$(2,191)$(1,972)
Schedule of Maturities of Notes
The following table summarizes the future principal payments for the Notes as of March 31, 2021 (in thousands):
2021, remaining$— 
2022— 
2023— 
202413,750 
2025— 
Thereafter120,000 
Total$133,750