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Long-term Debt (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020 (unaudited)
December 31, 2019
Liability component:2025 Notes2023 Notes2025 Notes2023 Notes
     Principal$230,000 $12,510 $— $143,750 
     Less: Unamortized debt discount(47,827)(1,137)— (16,033)
               Unamortized debt issuance costs(5,597)(212)— (3,053)
Net carrying amount$176,576 $11,161 $— $124,664 

    Interest expense for the three and nine months ended September 30, 2020 and 2019 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,
2020201920202019
Coupon interest$375 $— $375 $— 
Amortization of debt discount1,116 — 1,116 — 
Amortization of debt issuance costs151 — 151 — 
     Total interest expense recognized$1,642 $— $1,642 $— 

2023 Notes
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Coupon interest$446 $854 $2,153 $2,561 
Amortization of debt discount535 950 2,504 2,810 
Amortization of debt issuance costs110 206 522 618 
     Total interest expense recognized$1,091 $2,010 $5,179 $5,989