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Debt (Tables)
 9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Net Carrying Amount of Debt
The 2025 Notes consist of the following (in thousands):
September 30,
2021		December 31,
2020
Liability component
Principal$161,898 $166,898 
Add: fair value of embedded derivative 1,317 4,898 
Less: unamortized debt discount (2,972)(3,703)
Less: unamortized issuance costs(2,364)(2,946)
Net carrying amount$157,879 $165,147 
Schedule of Interest Expense The following table sets forth total interest expense recognized related to the Term Loan (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Contractual interest expense$— $— $— $1,667 
Amortization of debt discount— — — 859 
Amortization of debt issuance costs— — — 103 
Total interest expense$— $— $— $2,629 
The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Contractual interest expense$1,315 $1,278 $3,899 $2,078 
Amortization of debt discount207 217 622 341 
Amortization of debt issuance costs165 172 495 268 
Total interest expense$1,687 $1,667 $5,016 $2,687 
The following table sets forth total interest expense recognized related to the 2022 Notes (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Contractual interest expense$— $— $— $768 
Amortization of debt discount— — — 1,952 
Amortization of debt issuance costs— — — 111 
Total interest expense$— $— $— $2,831