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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Net Carrying Amount of Liability and Equity Component of Convertible Notes
The net carrying amount of the liability component of the 2025 Notes is as follows (in thousands):
June 30,
2022		December 31,
2021
Principal$1,150,000 $1,150,000 
Unamortized debt discount— (157,983)
Unamortized issuance costs(12,576)(12,667)
Net carrying amount$1,137,424 $979,350 


The net carrying amount of the equity component of the 2025 Notes is as follows (in thousands):
June 30,
2022		December 31,
2021
Debt discount for conversion option$— $220,061 
Issuance costs— (4,035)
Net carrying amount$— $216,026 
The net carrying amount of the liability component of the 2023 Notes is as follows (in thousands):
June 30,
2022		December 31,
2021
Principal$149,194 $149,194 
Unamortized debt discount— (8,641)
Unamortized issuance costs(507)(815)
Net carrying amount$148,687 $139,738 

The net carrying amount of the equity component of the 2023 Notes is as follows (in thousands):
June 30,
2022		December 31,
2021
Debt discount for conversion option$— $32,427 
Issuance costs— (765)
Net carrying amount$— $31,662 
Schedule of Interest Expense
The interest expense related to the 2025 Notes is as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Contractual interest expense$1,797 $1,797 $3,594 $3,594 
Amortization of debt discount— 10,155 — 20,184 
Amortization of issuance costs1,046 715 2,089 1,412 
Total interest expense$2,843 $12,667 $5,683 $25,190 
The interest expense related to the 2023 Notes is as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Contractual interest expense$93 $93 $186 $186 
Amortization of debt discount— 1,677 — 3,333 
Amortization of issuance costs179 147 357 290 
Total interest expense$272 $1,917 $543 $3,809