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Convertible Senior Notes
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Convertible Senior Notes Convertible Senior Notes
In August 2020, we issued $1.0 billion in aggregate principal amount of 0% convertible senior notes due in 2026 (2026 notes). In March/April 2019, we issued $800 million in aggregate principal amount of 0.125% convertible senior notes due in 2025 (2025 notes, together with the 2026 notes, the notes). The aggregate principal amounts of both the 2026 notes and 2025 notes include $100 million from the initial purchasers fully exercising their option to purchase additional notes. The notes were issued in private placements to qualified institutional buyers pursuant to Rule 144A of the Securities Act of 1933, as amended.
The following table presents the total net proceeds from the notes (in thousands):
2026 Notes2025 Notes
Principal amount$1,000,000 $800,000 
Less initial purchasers’ discount(15,000)(18,998)
Less other issuance costs(904)(822)
Net proceeds$984,096 $780,180 

The notes are our senior, unsecured obligations and are governed by indenture agreements by and between us and Computershare Trust Company, National Association (as successor to Wells Fargo Bank, National Association), as Trustee (the indentures). The 2026 notes bear no interest and will mature on September 1, 2026, unless repurchased, redeemed or converted in accordance with their terms prior to such date. The 2025 notes bear interest of 0.125% per year which is payable semi-annually in arrears on March 15 and September 15 of each year, beginning on September 15, 2019. The 2025 notes will mature on March 15, 2025, unless repurchased, redeemed or converted in accordance with their terms prior to such date.

Each $1,000 principal amount of the 2026 notes will initially be convertible into 9.2978 shares of our common stock. This is equivalent to an initial conversion price of approximately $107.55 per share, which is subject to adjustment in certain circumstances. Each $1,000 principal amount of the 2025 notes will initially be convertible into 19.3956 shares of our common stock. This is equivalent to an initial conversion price of approximately $51.56 per share, which is subject to adjustment in certain circumstances.

Prior to the close of business on the business day immediately preceding June 1, 2026 for the 2026 notes and December 15, 2024 for the 2025 notes, the notes are convertible at the option of holders only upon satisfaction of the following circumstances:

•during any calendar quarter commencing after the calendar quarter ending on December 31, 2020 for the 2026 notes and June 30, 2019 for the 2025 notes, if the last reported sale price of our 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 respective conversion price for the notes on each applicable trading day;
•during the five-business day period after any 10 consecutive trading day period (the measurement period) in which 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 of our common stock and the conversion rate on each such trading day;
•if we call any or all of the notes for redemption, at any time prior to the close of business on the second scheduled trading day immediately preceding the redemption date; or
•upon the occurrence of certain specified corporate events described in the indentures.

On or after June 1, 2026 for the 2026 notes and December 15, 2024 for the 2025 notes until the close of business on the second scheduled trading day immediately preceding the respective maturity dates, holders may convert their notes at any time, regardless of the foregoing circumstances. Upon conversion, the notes may be settled in shares of our common stock, cash or a combination of cash and shares of our common stock, at our election.

If we undergo a fundamental change, as defined in the indentures, prior to the respective maturity dates, subject to certain conditions, holders of the notes may require us to repurchase for cash all or any portion of their notes at a repurchase price equal to 100% of the principal amount of the notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. In addition, if specific corporate events, described in the indentures, occur prior to the respective maturity dates, we will also increase the conversion rate for a holder who elects to convert their notes in connection with such specified corporate events.

In August 2023, in connection with our securities repurchase program, we extinguished $169.7 million aggregate principal amount of the 2026 notes in privately-negotiated transactions for a total consideration of $135.8 million, which was paid to the holders in cash. We also incurred approximately $0.4 million in fees resulting in a total reacquisition price of $136.2 million. The carrying amount of the extinguished notes was $168.3 million resulting in a $32.1 million gain on early extinguishment of debt. We elected to reacquire and not cancel the extinguished 2026 notes.

In May 2023, in connection with our securities repurchase program, we extinguished $85.8 million and $341.1 million aggregate principal amount of the 2026 notes and 2025 notes, respectively, in privately-negotiated transactions for a total consideration of $368.6 million, which was paid to the holders in cash. We also incurred approximately $1.2 million in fees
resulting in a total reacquisition price of $369.8 million. The carrying amount of the extinguished notes was $423.5 million resulting in a $53.8 million gain on early extinguishment of debt. We elected to reacquire and not cancel the extinguished 2026 notes and the 2025 notes were canceled with the trustee. Additionally, we terminated 2025 notes capped call transactions underlying 6,615,161 shares of our common stock and received aggregate cash proceeds of $0.3 million.

As of December 31, 2023, we had 9,297,800 and 6,961,352 shares remaining underlying the 2026 notes and 2025 notes, respectively. During the year ended December 31, 2023, the conditions allowing holders of the 2026 notes and 2025 notes to convert were not met and therefore the 2026 notes and 2025 notes are not convertible. As of December 31, 2023, holders may convert the 2025 notes at any time within twelve months after the reporting date. As a result, we have classified the remaining net carrying amount of 2025 notes as a current liability.

The following table presents the net carrying amount of the notes (in thousands):
December 31, 2023December 31, 2022
2026 Notes2025 Notes2026 Notes2025 Notes
Principal amount$244,479 $358,914 $500,000 $699,979 
Unamortized issuance costs(1,721)(1,835)(4,837)(6,549)
Net carrying amount$242,758 $357,079 $495,163 $693,430 
    
The following table presents the total interest expense recognized related to the notes (in thousands):
Years Ended December 31,
2023
2022
2021
2026 notes:
Contractual interest expense
$— $— $— 
Amortization of issuance costs1,035 2,196 2,635 
Total 2026 notes interest expense$1,035 $2,196 $2,635 
2025 notes:
Contractual interest expense$621 $874 $896 
Amortization of issuance costs2,121 2,970 3,045 
Total 2025 notes interest expense$2,742 $3,844 $3,941 

Capped Call Transactions

Concurrently with the offering of the 2026 notes and 2025 notes, we used $103.4 million and $97.2 million, respectively, of the net proceeds to enter into privately negotiated capped call transactions which are expected to reduce or offset potential dilution to holders of our common stock upon conversion of the notes or offset the potential cash payments we would be required to make in excess of the principal amount of any converted notes. The capped call transactions automatically exercise upon conversion of the notes and as of December 31, 2023, cover 9,297,800 and 6,961,352 shares of our common stock for the 2026 notes and 2025 notes, respectively. These are intended to effectively increase the overall conversion price from $107.55 to $156.44 per share for the 2026 notes and $51.56 to $79.32 per share for the 2025 notes. The effective increase in conversion price as a result of the capped call transactions serves to reduce potential dilution to holders of our common stock and/or offset the cash payments we are required to make in excess of the principal amount of any converted notes. As these transactions meet certain accounting criteria, they are recorded in stockholders’ equity as a reduction of additional paid-in capital on our consolidated balance sheets and are not accounted for as derivatives. The fair value of the capped call instrument is not remeasured each reporting period. The cost of the capped call is not expected to be deductible for tax purposes.