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Debt (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Net Carrying Amount of Debt
The 2025 Notes consist of the following (in thousands):
December 31,
20212020
Principal$161,898 $166,898 
Add: fair value of embedded derivative 926 4,898 
Less: unamortized debt discount (2,761)(3,703)
Less: unamortized issuance costs(2,197)(2,946)
Net carrying amount$157,866 $165,147 
Schedule of Interest Expense The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):
Year Ended December 31,
20212020
Contractual interest expense$5,271 $3,434 
Amortization of debt discount829 552 
Amortization of debt issuance costs660 439 
Total interest expense$6,760 $4,425 
The following table sets forth total interest expense recognized related to the 2022 Notes (in thousands):
Year Ended December 31,
20202019
Contractual interest expense$768 $5,782 
Amortization of debt discount1,952 7,821 
Amortization of debt issuance costs111 459 
Total interest expense$2,831 $14,062 
The following table sets forth total interest expense recognized related to the Term Loan, 100% of which was attributable to a related party, during the years ended December 31, 2020 and 2019, respectively (in thousands):
Year Ended December 31,
20202019
Contractual interest expense$1,667 $4,789 
Amortization of debt discount859 1,331 
Amortization of debt issuance costs103 161 
Total interest expense$2,629 $6,281