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Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Net Carrying Amount of Debt
The Term Loan consisted of the following (in thousands):
December 31,
2019
Principal$47,500 
Less: unamortized debt discount and debt issuance costs(962)
Net carrying amount$46,538 
The 2025 Notes consist of the following (in thousands):
December 31,
2020
Liability component
Principal$166,898 
Add: fair value of embedded derivative 4,898 
Less: unamortized debt discount (3,703)
Less: unamortized issuance costs(2,946)
Net carrying amount$165,147 
The 2022 Notes consist of the following (in thousands):
December 31,
2019
Liability component
Principal$105,125 
Less: unamortized debt discount and issuance costs(3,791)
Net carrying amount$101,334 
Schedule of Interest Expense The following table sets forth total interest expense recognized related to the Term Loan during the years ended December 31, 2020 and 2019 (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 
The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):
Year Ended December 31, 2020
Contractual interest expense$3,434 
Amortization of debt discount552 
Amortization of debt issuance costs439 
Total interest expense$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