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Long-term Debt (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of long-term debt instruments
The liability component of the 2025 Notes and 2023 Notes consisted of the following (in thousands):

 June 30, 2021 (unaudited)
December 31, 2020
Liability component:2025 Notes2023 Notes2025 Notes2023 Notes
     Principal$230,000 $5,090 $230,000 $5,090 
     Less: Unamortized debt discount(41,311)(352)(45,690)(426)
               Unamortized debt issuance costs(4,696)(64)(5,271)(79)
Net carrying amount$183,993 $4,674 $179,039 $4,585 

Interest expense for the three and six months ended June 30, 2021 and 2020 related to the 2025 Notes and 2023 Notes consisted of the following (in thousands):

2025 Notes
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Coupon interest$719 $— $1,438 $— 
Amortization of debt discount2,200 — 4,379 — 
Amortization of debt issuance costs288 — 575 — 
     Total interest expense recognized$3,207 $— $6,392 $— 

2023 Notes
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Coupon interest$30 $853 $60 $1,707 
Amortization of debt discount37 992 74 1,969 
Amortization of debt issuance costs8 206 15 412 
     Total interest expense recognized$75 $2,051 $149 $4,088