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Convertible Senior Notes | 6 Months Ended
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Jun. 30, 2023
Debt Disclosure [Abstract] |
Convertible Senior Notes | 8. Convertible Senior Notes 0.375% Convertible Senior Notes due 2024 On July 19, 2019, the Company issued $287.5 million aggregate principal pursuant to the 2019 Notes, which includes the underwriters’ exercise in full of an option to purchase an additional $37.5 million aggregate principal amount of 2019 Notes (the “Notes Offering”). The net proceeds of the Notes Offering, after deducting underwriting discounts and commissions and other related offering expenses payable by the Company, were approximately $278.5 million. The 2019 Notes are senior, unsecured obligations of the Company, and bear interest at a rate of 0.375% per year. Interest is payable semi-annually in arrears on January 15 and July 15 of each year, beginning on January 15, 2020. The 2019 Notes will mature on July 15, 2024, unless earlier repurchased or converted in accordance with their terms. During the second quarter of 2023, the closing price of the Company’s common stock exceeded 130% of the conversion price of the 2019 Notes for more than 20 trading days of the last 30 consecutive trading days of the quarter. As a result, the 2019 Notes are convertible at the option of the holders of the 2019 Notes during the third quarter of 2023, the quarter immediately following the quarter when the conditions are met, as stated in the terms of the 2019 Notes. These conditions have been met each quarter since the third quarter of 2020. As a result, $0.1 million aggregate principal amount of the 2019 Notes have been requested for conversion by the note holders since the issuance of the 2019 Notes and all conversions have settled as of June 30, 2023 except $24,000 aggregate principal amount, which settles in the third quarter of 2023. The conversions resulted in the issuance of a nominal number of shares of the Company’s common stock to the note holders. The Company continues to classify the carrying value of the 2019 Notes as current liabilities on the Company’s condensed consolidated balance sheets at June 30, 2023. The net carrying value of the liability component of the 2019 Notes is as follows:
|  | June 30, 2023 |  |  | December 31, 2022 |
|  | (Amounts in thousands) |
0.375% Convertible Senior Notes due 2024: |  |  |  |  |  |
Principal amount |  | $ | 287,461 |  |  | $ | 287,470 |
Unamortized debt issuance costs |  |  | (1,940 | ) |  |  | (2,855 | )
Net carrying amount |  | $ | 285,521 |  |  | $ | 284,615 |
The following table sets forth total interest expense recognized related to the 2019 Notes:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
|  | (Amounts in thousands) |
Contractual interest expense |  | $ | 269 |  |  | $ | 269 |  |  | $ | 539 |  |  | $ | 539 |
Amortization of debt issuance costs |  |  | 457 |  |  |  | 453 |  |  |  | 914 |  |  |  | 905 |
Total |  | $ | 726 |  |  | $ | 722 |  |  | $ | 1,453 |  |  | $ | 1,444 |
Effective interest rate of the liability component |  |  | 1 | % |  |  | 1 | % |  |  | 1 | % |  |  | 1 | %
At June 30, 2023 and December 31, 2022, the carrying value of the 2019 Notes was $285.5 million and $284.6 million, respectively, net of unamortized discount, and the fair value of the 2019 Notes was $372.8 million and $452.0 million, respectively. The fair value of the 2019 Notes was determined based on the most recent trade activity of the 2019 Notes at June 30, 2023 and December 31, 2022.

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