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Debt (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Net Carrying Amount of Debt
The 2025 Notes consist of the following (in thousands):
June 30,
2021		December 31,
2020
Liability component
Principal$161,898 $166,898 
Add: fair value of embedded derivative 2,929 4,898 
Less: unamortized debt discount (3,178)(3,703)
Less: unamortized issuance costs(2,529)(2,946)
Net carrying amount$159,120 $165,147 
Schedule of Interest Expense The following table sets forth total interest expense recognized related to the Term Loan (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Contractual interest expense$— $516 $— $1,667 
Amortization of debt discount— 526 — 859 
Amortization of debt issuance costs— 63 — 103 
Total interest expense$— $1,105 $— $2,629 
The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Contractual interest expense$1,315 $800 $2,584 $800 
Amortization of debt discount207 124 415 124 
Amortization of debt issuance costs165 96 330 96 
Total interest expense$1,687 $1,020 $3,329 $1,020 
The following table sets forth total interest expense recognized related to the 2022 Notes (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Contractual interest expense$— $286 $— $768 
Amortization of debt discount— 700 — 1,952 
Amortization of debt issuance costs— 39 — 111 
Total interest expense$— $1,025 $— $2,831