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Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments The liability components of the 2025 and 2023 Notes consisted of the following (in thousands):
 December 31, 2020December 31, 2019
Liability component:2025 Notes2023 Notes2025 Notes2023 Notes
     Principal$230,000 $5,090 $— $143,750 
     Less: Unamortized debt discount(45,690)(426)— (16,033)
               Unamortized debt issuance costs(5,271)(79)— (3,053)
Net carrying amount$179,039 $4,585 $— $124,664 

    Interest expense for the years ended December 31, 2020, 2019 and 2018 related to the Notes consisted of the following (in thousands):

2025 Notes
Year Ended December 31,
 202020192018
Coupon interest$1,094 $— $— 
Amortization of debt discount3,254 — — 
Amortization of debt issuance costs438 — — 
     Total interest expense recognized$4,786 $— $— 
2023 Notes
Year Ended December 31,
 202020192018
Coupon interest$2,200 $3,414 $1,043 
Amortization of debt discount2,561 3,773 1,111 
Amortization of debt issuance costs533 824 252 
     Total interest expense recognized$5,294 $8,011 $2,406