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Indebtedness (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt
Long-term debt as of June 30, 2021 consisted of the following (in thousands):
June 30, 2021December 31, 2020
Term loan$30,000 $30,000 
Debt discount and issuance costs(1,095)(1,256)
Long-term debt$28,905 $28,744 
Schedule of Future Minimum Principal Payments
The scheduled future minimum principal payments are as follows (in thousands)
June 30, 2021
2021 (remaining 6 months)$— 
20225,806 
202311,613 
202411,613 
2025968 
Total$30,000 
Schedule of Net Carrying Amount of Liability Component
The net carrying amount of the liability component of the 2027 Notes was as follows (in thousands):
June 30, 2021December 31, 2020
Principal amount$200,000 $200,000 
Unamortized debt discount(52,973)(56,080)
Unamortized debt issuance cost(262)(278)
Net carrying amount$146,765 $143,642 
Schedule of Equity Components
The net carrying amount of the equity component of the 2027 Notes was as follows (in thousands):
June 30, 2021December 31, 2020
Debt discount related to the value of conversion option$53,635 $53,635 
Debt issuance cost(109)(109)
Net carrying amount$53,526 $53,526 
Schedule of Interest Expense Recognized
The following table sets forth the interest expense recognized related to the 2027 Notes (in thousands):
Three months ended June 30,Six months ended June 30,
2021202020212020
Contractual interest expense$2,472 $1,139 $4,972 $1,139 
Amortization of debt discount1,589 642 3,107 642 
Amortization of debt issuance cost8 3 16 3 
Total interest expense related to the 2027 Notes$4,069 $1,784 $8,095 $1,784