2023 Unsecured Convertible Senior Notes
Our 2023 Notes are unsecured and accrue interest at an annual rate of 6.25% per annum, payable semi-annually in arrears on May 15 and November 15 of each year. The 2023 Notes mature on November 15, 2023 unless earlier purchased, redeemed or converted in accordance with their terms.
The unamortized debt issuance costs of $0.3 million as of June 30, 2023 will be amortized to interest expense at an effective interest rate of 7.0% over the remaining term.
Subject to the satisfaction of certain conditions, the 2023 Notes are convertible into cash, shares of our common stock or a combination thereof, as we elect at our sole discretion. The initial conversion rate is 52.0183 shares of our common stock per $1,000 of note principal (equivalent to an initial conversion price of approximately $19.22 per share of common stock), which equals approximately 4.9 million shares of common stock issuable upon conversion, subject to adjustment in certain circumstances.
To reduce the dilutive impact or potential cash expenditure associated with the conversion of the 2023 Notes, we entered into a capped call transaction (the “2023 Capped Call”), which covers the number of shares of our common stock underlying the 2023 Notes when our common stock share price is trading between the initial conversion price of $19.22 and $28.84. However, should the market price of our common stock exceed the $28.84 cap, then the conversion of the 2023 notes could have a dilutive impact or may require a cash expenditure to the extent the market price exceeds the cap price. As of June 30, 2023, approximately 4.9 million shares remained outstanding on the 2023 Capped Call.
The following table sets forth total interest expense recognized in connection with the 2023 Notes:
| | | | | | | | | | | | |
| | Three Months Ended | | Six Months Ended |
| | June 30, | | June 30, |
| | 2023 | | 2022 | | 2023 | | 2022 |
|
| | (In thousands) | | (In thousands) |
Contractual interest expense | | $ | 1,484 | | $ | 1,484 | | $ | 2,969 | | $ | 2,969 |
Amortization of debt issuance costs | | | 176 | | | 164 | | | 349 | | | 325 |
Total | | $ | 1,660 | | $ | 1,648 | | $ | 3,318 | | $ | 3,294 |
2026 Unsecured Convertible Senior Notes
Our 2026 Notes are unsecured and accrue interest at an annual rate of 5.25% per annum, payable semi-annually in arrears on February 15 and August 15 of each year. The 2026 Notes mature on February 15, 2026, unless earlier purchased, redeemed or converted in accordance with their terms.
The unamortized debt issuance costs of $3.5 million as of June 30, 2023 will be amortized to interest expense at an effective interest rate of 5.9% over the remaining term.
Subject to the satisfaction of certain conditions, the 2026 Notes are convertible into cash, shares of our common stock or a combination thereof, as we elect at our sole discretion. The initial conversion rate is 54.0906 shares of our common stock per $1,000 of note principal (equivalent to an initial conversion price of approximately $18.4875 per share of common stock), which equals approximately 12.2 million shares of common stock issuable upon conversion, subject to adjustment in certain circumstances.
To reduce the dilutive impact or potential cash expenditure associated with the conversion of the 2026 Notes, we entered into capped call transactions (the “2026 Capped Calls”), which cover the number of shares of our common stock underlying the 2026 Notes when our common stock share price is trading between the initial conversion price of $18.49 and $26.10. However, should the market price of our common stock exceed the $26.10 cap, then the conversion of the 2026 Notes would have a dilutive impact or may require a cash expenditure to the extent the market price exceeds the cap price. As of June 30, 2023, approximately 12.2 million shares remained outstanding on the 2026 Capped Call.