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Debt (Tables)
 6 Months Ended
Jun. 30, 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 2024 Notes and 2026 Notes as of June 30, 2020:
(in thousands)2024 Notes2026 Notes
Principal amount of 2024 Notes outstanding$13,750  $120,000  
Unamortized discount (including unamortized debt issuance cost)(3,055) (27,884) 
Total long-term portion of notes payable$10,695  $92,116  
The following table summarizes interest expense recognized on the 2024 Notes and 2026 Notes:
(in thousands)Three Months Ended June 30, 2020
20202019
Contractual interest expense$1,000  $498  
Amortization of debt issuance costs and discount1,102  746  
Total interest expense$2,102  $1,244  
(in thousands)Six Months Ended June 30,
 20202019
Contractual interest expense$2,015  $644  
Amortization of debt issuance costs and discount2,059  746  
Total interest expense$4,074  $1,390  
Schedule of Maturities of Notes
The following table summarizes the future principal payments for the 2024 Notes and 2026 Notes (in thousands):
2020, remaining$—  
2021—  
2022—  
2023—  
202413,750  
Thereafter120,000  
$133,750