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Debt
 9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Debt Debt
Repurchase Transaction
In connection with the issuance of the 2029 convertible senior notes on March 1, 2024, the Company used part of the net proceeds from the issuance to repurchase approximately $313.1 million aggregate principal amount of the outstanding 2025 convertible senior notes in privately-negotiated transactions for aggregate cash consideration of approximately $304.9 million (the “Repurchase Transaction”).
The Repurchase Transaction was accounted for as a debt extinguishment. The difference between the consideration used to extinguish the 2025 convertible senior notes and the carrying value of the 2025 convertible
senior notes (including unamortized debt discount and issuance costs) resulted in an extinguishment gain of approximately $6.6 million recorded in Other income (expense), net on the Company’s condensed consolidated statements of operations and comprehensive income (loss).
In connection with the Repurchase Transaction, the Company also entered into a partial termination agreement with each bank counterparty and unwound a corresponding portion of the previously purchased capped call instruments entered into in connection with the issuance of the 2025 convertible senior notes (the “2025 Capped Calls”). The Company received approximately $0.5 million in cash in connection with these partial terminations, representing the fair value at the date of settlement of the unwound 2025 Capped Calls.
2029 Convertible Senior Notes and Related Capped Call Transactions
In March 2024, the Company issued $747.5 million aggregate principal amount of 2029 convertible senior notes in a private offering, which aggregate principal amount included the exercise in full of the initial purchasers’ option to purchase up to an additional $97.5 million principal amount of the 2029 convertible senior notes. The 2029 convertible senior notes mature on March 15, 2029 and bear interest at a fixed rate of 1.00% per annum, payable semiannually in arrears on March 15 and September 15 of each year, beginning on September 15, 2024. The total net proceeds from the issuance of the 2029 convertible senior notes, after deducting initial purchasers' discounts and commissions and estimated debt issuance costs, were approximately $728.8 million.
Each $1,000 principal amount of the 2029 convertible senior notes is initially convertible into 12.5918 shares of the Company’s common stock (the “2029 Conversion Option”), which is equivalent to an initial conversion price of approximately $79.42 per share of common stock, subject to adjustment upon the occurrence of specified events. The initial conversion price represents a premium of approximately 30% to the $61.09 per share closing price of the Company’s common stock on The Nasdaq Global Market on February 27, 2024. There have been no changes to the initial conversion price of the 2029 convertible senior notes since issuance. The 2029 convertible senior notes are convertible, in multiples of $1,000 principal amount, at the option of the holders prior to the close of business on the business day immediately preceding December 15, 2028, only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on June 30, 2024 (and only during such calendar quarter), if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “2029 Measurement Period”) in which the trading price (as defined in the 2029 Indenture governing the 2029 convertible senior notes) per $1,000 principal amount of the 2029 convertible senior notes for each trading day of the 2029 Measurement Period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate in effect on each such trading day; (3) if the Company calls any or all of the 2029 convertible senior notes for redemption, at any time prior to the close of business on the second scheduled trading day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate events. On or after December 15, 2028 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their 2029 convertible senior notes, in multiples of $1,000 principal amount, at the option of the holder regardless of the foregoing circumstances.
Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of the Company’s common stock or a combination of cash and shares of the Company’s common stock, at the Company’s election. If the Company undergoes a fundamental change (as defined in the indenture governing the 2029 convertible senior notes), subject to certain conditions, holders may require the Company to repurchase for cash all or any portion of their 2029 convertible senior notes, in principal amounts of $1,000 or a multiple thereof, at a fundamental change repurchase price equal to 100% of the principal amount of the 2029 convertible senior notes to be repurchased, plus accrued and unpaid interest, if any, to, but excluding, the fundamental change repurchase date. In addition, following certain corporate events or if the Company issues a notice of redemption, it will, under certain circumstances, increase the conversion rate for holders who elect to convert their notes in connection with such corporate event or during the relevant redemption period.
The closing market price of the Company's common stock of $24.20 per share on September 30, 2025, the last trading day during the three months ended September 30, 2025, was below $103.24 per share, which represents 130% of the initial conversion price of $79.42 per share. Additionally, the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day, September 30, 2025, was not greater than or equal to 130% of the initial conversion price. As such, during the three months ended September 30, 2025, the conditions allowing holders of the 2029 convertible senior notes to convert were not met. The 2029 convertible senior notes are therefore not convertible during the three months ending December 31, 2025.
The Company may not redeem the 2029 convertible senior notes prior to March 22, 2027. The Company may redeem for cash all or any portion of the 2029 convertible senior notes, at its option, on or after March 22, 2027 and prior to December 15, 2028, if the last reported sale price of its common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption at a redemption price equal to 100% of the principal amount of the 2029 convertible senior notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. However, the Company may not redeem less than all of the outstanding 2029 convertible senior notes unless at least $100.0 million aggregate principal amount of 2029 convertible senior notes are outstanding and not called for redemption at the time the redemption notice is sent. No sinking fund is provided for the 2029 convertible senior notes.
The 2029 convertible senior notes are the Company’s senior unsecured obligations and rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated in right of payment to the 2029 convertible senior notes; equal in right of payment to any of the Company’s unsecured indebtedness that is not so subordinated (including the 2025 convertible senior notes); effectively junior in right of payment to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities.
The net carrying amount of the 2029 convertible senior notes was as follows (in thousands):
September 30, 2025December 31, 2024
Principal$747,500 $747,500 
Unamortized issuance costs(12,947)(15,645)
Net carrying amount$734,553 $731,855 
Interest expense related to the 2029 convertible senior notes was as follows (in thousands):
Three Months EndedNine Months Ended
September 30, 2025September 30, 2024September 30, 2025September 30, 2024
Contractual interest expense$1,869 $1,869 $5,606 $4,360 
Amortization of issuance costs933 920 2,699 2,090 
Total interest expense$2,802 $2,789 $8,305 $6,450 
The debt issuance costs are amortized into interest expense over the term of the 2029 convertible senior notes at an effective interest rate of 1.49%.
In connection with the issuance of the 2029 convertible senior notes, the Company entered into privately negotiated capped call transactions (each a “2029 Capped Call,” and collectively the "2029 Capped Calls") with certain financial institutions. The 2029 Capped Call has an initial strike price of approximately $79.42, subject to certain adjustments, which corresponds to the initial conversion price of the 2029 convertible senior notes. The 2029 Capped Calls have an initial cap price of $122.18 per share, subject to certain adjustments. The 2029 Capped Calls are expected to partially offset the potential dilution to the Company’s common stock upon any conversion of the 2029 convertible senior notes, with such offset subject to a cap based on the cap price. Each 2029 Capped Call covers, subject to anti-dilution adjustments, approximately 9.4 million shares of the Company’s common stock. The 2029 Capped Call is subject to adjustment upon the occurrence of specified extraordinary events affecting the Company, including merger events, tender offers, and announcement events. In addition, each 2029 Capped Call is subject to certain specified additional disruption events that may give rise to a termination of the 2029 Capped Calls, including nationalization, insolvency or delisting, changes in law, failures to deliver, insolvency filings, and hedging disruptions. For accounting purposes, each 2029 Capped Call is treated as a separate transaction from, and not part of the terms of the 2029 convertible senior notes. As these transactions meet certain accounting criteria, the 2029 Capped Calls are recorded in stockholders' equity and are not accounted for as derivatives. The 2029 Capped Calls will not be remeasured as long as they continue to meet the conditions for equity classification.
2025 Convertible Senior Notes and Related Capped Call Transactions
In May and June 2020, the Company issued $747.5 million aggregate principal amount of 2025 convertible senior notes in a private offering, which aggregate principal amount included the exercise in full of the initial purchasers’ option to purchase up to an additional $97.5 million principal amount of the 2025 convertible senior
notes. The total net proceeds from the issuance of the 2025 convertible senior notes, after deducting initial purchasers' discounts and commissions and estimated debt issuance costs, were approximately $728.8 million.
In March 2024, the Company used part of the net proceeds from the issuance of the 2029 convertible senior notes to repurchase $313.1 million aggregate principal amount of the 2025 convertible senior notes in privately-negotiated transactions.
The 2025 convertible senior notes matured on June 1, 2025, and the Company settled its obligations with respect to the 2025 convertible senior notes in cash in connection therewith. Prior to maturity, the 2025 convertible senior notes bore interest at a fixed rate of 0.500% per annum, payable semiannually in arrears on June 1 and December 1 of each year. There were no changes to the 2025 convertible senior notes' initial conversion price of approximately $134.34 per share of common stock since the date of issuance.
The net carrying amount of the 2025 convertible senior notes as of December 31, 2024 was $433.5 million. There were no 2025 convertible senior notes outstanding as of September 30, 2025.
Interest expense related to the 2025 convertible senior notes was as follows (in thousands):
Three Months EndedNine Months Ended
September 30, 2025September 30, 2024September 30, 2025September 30, 2024
Contractual interest expense$— $543 $905 $1,890 
Amortization of issuance costs— 562 915 1,901 
Total interest expense$— $1,105 $1,820 $3,791 
In connection with the issuance of the 2025 convertible senior notes, the Company entered into privately negotiated capped call transactions (each a “2025 Capped Call,” and collectively the "2025 Capped Calls") with certain financial institutions. The 2025 Capped Calls each had an initial strike price of approximately $134.34, which corresponded to the initial conversion price of the 2025 convertible senior notes. In connection with the Repurchase Transaction, the Company unwound a portion of the 2025 Capped Calls. Refer to the Repurchase Transaction section above for further information. The remaining 2025 Capped Calls covered, subject to anti-dilution adjustments, approximately 3.2 million shares of the Company’s common stock. For accounting purposes, each 2025 Capped Call was a separate transaction from, and not part of the terms of the 2025 convertible senior notes. As these transactions met certain accounting criteria, the 2025 Capped Calls were recorded in stockholders' equity and were not accounted for as derivatives. Upon maturity, the outstanding 2025 Capped Calls associated with the 2025 convertible senior notes were settled with no consideration received since their strike prices were in excess of the Company's stock price at that time.