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Debt (Tables)
12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Debt
The following table presents the outstanding principal amount and carrying value of the Notes as of the dates indicated (in thousands):
As of December 31, 2023
2021 Notes2020 Notes2019 Notes2018 NotesTotal
Principal$1,000,000 $650,000 $649,887 $— $2,299,887 
Unamortized debt issuance costs8,471 4,376 3,223 — 16,070 
Net carrying value$991,529 $645,624 $646,664 $— $2,283,817 
As of December 31, 2022
2021 Notes2020 Notes2019 Notes2018 NotesTotal
Principal$1,000,000 $650,000 $649,932 $44 $2,299,976 
Unamortized debt issuance costs10,371 5,569 4,396 — 20,336 
Net carrying value$989,629 $644,431 $645,536 $44 $2,279,640 
Schedule of Maturities of Convertible Notes
The terms of the Notes are summarized below:
Convertible NotesMaturity DateContractual Convertibility Date (1)Initial Conversion Rate per $1,000 Principal (2)Initial Conversion PriceAnnual Effective Interest Rate
2021 NotesJune 15, 2028February 15, 20284.0518 $246.80 0.4 %
2020 NotesSeptember 1, 2027May 1, 20275.0007 199.97 0.3 %
2019 NotesOctober 1, 2026June 1, 202611.4040 87.69 0.3 %
2018 Notes
March 1, 2023November 1, 202227.5691 36.27 — %
(1)Based on the daily closing prices of the Company’s stock during the quarter ended December 31, 2023, holders of the 2021 Notes, 2020 Notes, and 2019 Notes are not eligible to convert their 2021 Notes, 2020 Notes, and remaining 2019 Notes, respectively, during the first quarter of 2024.
(2)The initial conversion rate will be subject to adjustment upon the occurrence of certain specified events, including certain distributions and dividends to all or substantially all of the holders of the Company’s common stock.
Schedule of Interest Expense
Interest expense, which consists of coupon interest and amortization of debt issuance costs, related to each of the Notes for the periods presented below was as follows (in thousands):

Year Ended  
December 31,

202320222021
2021 Notes$4,400 $4,400 $2,411 
2020 Notes2,006 2,006 2,006 
2019 Notes1,985 1,985 1,985 
2018 Notes— — 44 
Total interest expense
$8,391 $8,391 $6,446 
Schedule of Capped Call Transactions
The initial terms of the Company’s Capped Call Transactions are presented below:
Capped Call TransactionsMaturity DateInitial Cap Price per ShareCap Price Premium
2021 Capped Call TransactionsJune 15, 2028$340.42 100 %
2020 Capped Call TransactionsSeptember 1, 2027327.83150 %
2019 Capped Call TransactionsOctober 1, 2026148.63150 %