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Debt (Tables)
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Summary of Long-term Debt Instruments Further details of the Notes are as follows:
IssuanceMaturity DateInterest RateFirst Interest Payment DateEffective Interest RateSemi-Annual Interest Payment DatesInitial Conversion Rate per $1,000 PrincipalInitial Conversion PriceNumber of Shares (in millions)
2025 NotesMay 1, 20252.25%November 1, 20202.88%May 1 and November 116.3875$61.02 0.8
2027 NotesMarch 15, 20270.25%September 15, 20210.67%March 15 and September 159.6734$103.38 5.8
2029 NotesMarch 15, 20291.25%March 15, 20241.69%March 15 and September 1515.4213$64.85 4.6
Summary of Liability and Equity Components of Convertible Debt
The net carrying amount of the Notes as of December 31, 2023 and December 31, 2022 was as follows (in thousands):
2025 Notes2027 Notes2029 Notes
PrincipalUnamortized debt issuance costsTotalPrincipalUnamortized debt issuance costsTotalPrincipalUnamortized debt issuance costsTotal
Balance at December 31, 2022$229,992 $(3,480)$226,512 $600,000 $(10,564)$589,436 $— $— $— 
Issuance— — — — — — 300,000 (7,909)292,091 
Partial repurchase(184,000)2,010 (181,990)— — — — — — 
Amortization of debt issuance costs— 1,066 1,066 — 2,487 2,487 — 394 394 
Balance at December 31, 2023$45,992 $(404)$45,588 $600,000 $(8,077)$591,923 $300,000 $(7,515)$292,485 
Interest expense related to the Notes was as follows (in thousands):
Year Ended December 31,
202320222021
2025 Notes2027 Notes2029 NotesTotal2025 Notes2027 NotesTotal2023 Notes2025 Notes2027 NotesTotal
Contractual interest expense$3,795 $1,500 $1,167 $6,462 $5,174 $1,502 $6,676 $950 $5,175 $1,164 $7,289 
Amortization of debt issuance costs1,066 2,487 394 3,947 1,425 2,468 3,893 $498 $1,384 $1,948 $3,830 
Induced conversion expense53,889 — — 53,889 — — — 2,740 — — 2,740 
Total interest expense$58,750 $3,987 $1,561 $64,298 $6,599 $3,970 $10,569 $4,188 $6,559 $3,112 $13,859 
Summary of Other Key Terms and Premiums Paid for the Capped Calls Related to Each Series of Notes
The following table sets forth other key terms and premiums paid for the Capped Calls related to each series of Notes:
Capped Calls Entered into in Connection with the Issuance of the 2023 NotesCapped Calls Entered into in Connection with the Issuance of the 2025 NotesCapped Calls Entered into in Connection with the Issuance of the 2027 NotesCapped Calls Entered into in Connection with the Issuance of the 2029 Notes
Initial strike price, subject to certain adjustments$41.59 $61.02 $103.38 $64.85 
Cap price, subject to certain adjustments$63.98 $93.88 $159.04 $97.88 
Total premium paid (in thousands)$26,910 $27,255 $76,020 $36,570 
Expiration datesJune 2, 2023 - August 1, 2023March 4, 2025 - April 29, 2025January 1, 2027 - March 11, 2027February 13, 2029 - March 13, 2029