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Long-term Debt (Tables)
 9 Months Ended
Sep. 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):

 September 30, 2021 (unaudited)
December 31, 2020
Liability component:2025 Notes2023 Notes2025 Notes2023 Notes
     Principal$230,000 $— $230,000 $5,090 
     Less: Unamortized debt discount(39,064)— (45,690)(426)
               Unamortized debt issuance costs(4,409)— (5,271)(79)
Net carrying amount$186,527 $— $179,039 $4,585 

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

2025 Notes
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Coupon interest$718 $375 $2,156 $375 
Amortization of debt discount2,246 1,116 6,625 1,116 
Amortization of debt issuance costs291 151 866 151 
     Total interest expense recognized$3,255 $1,642 $9,647 $1,642 
2023 Notes
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Coupon interest$15 $446 $75 $2,153 
Amortization of debt discount17 535 91 2,504 
Amortization of debt issuance costs3 110 18 522 
     Total interest expense recognized$35 $1,091 $184 $5,179