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Convertible Senior Notes | 12 Months Ended
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Dec. 31, 2024
Convertible Notes Payable [Abstract] |
Convertible Senior Notes | Convertible Senior Notes 2027 Notes In December 2022, we issued $690.0 million aggregate principal amount of our 2027 Notes (the "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 $90.0 million principal amount of the Notes. The Notes mature on December 15, 2027 and bear interest at a fixed rate of 0.50% per annum, payable semiannually in arrears on June 15 and December 15 of each year, beginning on June 15, 2023. The total net proceeds from the issuance of the Notes, after deducting initial purchasers’ discounts and commissions and estimated debt issuance costs of $16.2 million, were approximately $673.8 million. The effective interest rate for the Notes was 0.99% and included interest payable and amortization of debt issuance cost. The terms of the Notes allow for conversion into common stock, cash, or a combination of cash and common stock, at our option. On or after December 22, 2025, we may redeem for cash all or any portion of the notes in accordance with the optional redemption terms of the convertible debt agreement.
| December 31, 2024
| Maturity Date |  | Initial Conversion Price per Share |  | Initial Conversion Rate per $1,000 Par Value |  | Initial Number of Shares
2027 Notes | December 15, 2027 |  | $228.73 |  | 4.3720 shares |  | 3,016,680
The 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 September 15, 2027 only under the following circumstances: •during any calendar quarter commencing after the calendar quarter ending on March 31, 2023 (and only during such fiscal quarter), if the last reported sale price per common stock exceeds 130% of the conversion price for each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter; •any time preceding September 15, 2027, when during the five consecutive business days immediately after any 10 consecutive trading day period (the “Measurement Period”), if the trading price per $1,000 principal amount of Notes for each trading day of the Measurement Period was less than 98% of the product of the last reported sale price per share of common stock on such trading day and the conversion rate on such trading day; •upon the occurrence of certain corporate events or distributions on our ordinary shares, as provided in the indenture governing the Notes; •if we call the Notes for redemption; or any time from, and including, September 15, 2027 until the close of business on the second scheduled trading day immediately before the maturity date If we undergo a fundamental change (as defined in the indenture governing the Notes), holders may require us to repurchase for cash all or any portion of their Notes at a fundamental change repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any, up to but excluding the fundamental change repurchase date. In addition, following certain corporate events or if we issue a notice of redemption, it will 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 following table summarizes the carrying value of the Notes (in thousands):
| December 31, 2024 |  | December 31, 2023
Principal | $ | 690,000 |  | $ | 690,000
Unamortized debt issuance costs | (9,711) |  |  | (12,887) |
Convertible notes carrying amount, net | $ | 680,289 |  | $ | 677,113
We consider the fair value of the Notes to be a Level 2 measurement. The estimated fair value of the Notes at December 31, 2024 and December 31, 2023 is based on the closing trading price per $1,000 of the Notes as of the last day of trading for each period as follows (in millions):
| December 31, 2024 |  | December 31, 2023
2027 Notes | $ | 1,798.5 |  | $ | 873.3
Interest expense related to the Notes was as follows (in thousands):
| December 31, 2024 |  | December 31, 2023
Contractual interest expense | $ | 3,451 |  | $ | 3,450
Amortization of debt issuance costs | 3,176 |  | 3,126
Total interest expense | $ | 6,627 |  | $ | 6,576
Note Hedge To reduce the impact of potential economic dilution upon conversion of the Notes, we entered into a convertible note hedge transaction (the “Note Hedge” or “2027 Note Hedge”) with certain investment banks, with respect to our common stock, concurrently with the issuance of the 2027 Notes.
| Purchase Price |  | Shares Purchased
2027 Note Hedge | $ | 194,994 |  | 3,016,680
The Note Hedge covers shares of our common stock at a strike price per share that corresponds to the initial conversion price of the respective Notes, subject to adjustment, and is exercisable upon conversion of the Notes. If exercised, we may elect to receive cash, shares of our common stock, or a combination of cash and shares. We have accounted for the aggregate amount of purchase price for the Note Hedge as a reduction to additional paid-in capital. The Note Hedge will expire upon the maturity of the Notes. The Note Hedge is intended to reduce the potential economic dilution upon conversion of the Notes in the event that the market value per share of our common stock at the time of exercise is greater than the conversion price of the Notes. The Note Hedge is a separate transaction and is not part of the terms of the Notes. Holders of the Notes do not have any rights with respect to the Note Hedge. The Note Hedge does not impact earnings per share, as it was entered into to offset any dilution from the Notes. As of December 31, 2024, 3,016,680 shares remain subject to the Note Hedge. Note Warrants
| Proceeds |  | Shares |  | Strike Price |  | First Expiration
2027 Warrants | $ | 124,269 |  | 3,016,680 |  | $ | 338.86 |  | March 15, 2028
Separately, we entered into warrant transactions with certain investment banks, whereby we sold warrants to acquire, subject to adjustment, the number of shares of our com mon stock shown in the table above. If the average market value per share of our common stock exceeds the strike price of the Warrants, such Warrants would have a dilutive effect on our earnings per share to the extent we report net income. According to the terms of the Warrants, the Warrants will be automatically exercised over a 60-trading day period beginning on the first expiration date as set forth above.

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