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Convertible Senior Notes (Tables)
 9 Months Ended
Sep. 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):
September 30,
2022		December 31,
2021
Principal$1,150,000 $1,150,000 
Unamortized debt discount— (157,983)
Unamortized issuance costs(11,528)(12,667)
Net carrying amount$1,138,472 $979,350 


The net carrying amount of the equity component of the 2025 Notes is as follows (in thousands):
September 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):
September 30,
2022		December 31,
2021
Principal$149,194 $149,194 
Unamortized debt discount— (8,641)
Unamortized issuance costs(329)(815)
Net carrying amount$148,865 $139,738 

The net carrying amount of the equity component of the 2023 Notes is as follows (in thousands):
September 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 September 30,Nine Months Ended September 30,
2022202120222021
Contractual interest expense$1,797 $1,797 $5,391 $5,391 
Amortization of debt discount— 10,281 — 30,465 
Amortization of issuance costs1,049 735 3,138 2,147 
Total interest expense$2,846 $12,813 $8,529 $38,003 
The interest expense related to the 2023 Notes is as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Contractual interest expense$93 $93 $279 $279 
Amortization of debt discount— 1,699 — 5,032 
Amortization of issuance costs178 151 535 441 
Total interest expense$271 $1,943 $814 $5,752