| Schedule of Convertible Notes |
The following table presents details of the Company's convertible senior notes, which are further discussed below (original principal in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Month Issued | | Maturity Date (1) | | Original Principal | | Interest Rate per Annum | | Conversion Rate for Each $1,000 Principal (2) | | Initial Conversion Price per Share | | 2023 Notes | | February 15, 2018 | | February 15, 2023 | | $ | 230,000 | | | 0.75 | % | | $ | 17.4292 | | | $ | 57.38 | | | 2026 Notes | | June 1, 2019 | | June 1, 2026 | | $ | 316,250 | | | 0.75 | % | | $ | 11.2851 | | | $ | 88.61 | | | 2025 Notes | | November 15, 2020 | | November 15, 2025 | | $ | 350,000 | | | 0.125 | % | | $ | 7.1355 | | | $ | 140.14 | |
___________________________________________________________________________ (1) Unless earlier converted or repurchased in accordance with their terms prior to such date (2) Subject to adjustment upon the occurrence of certain specified events The 2023 Notes, 2026 Notes and 2025 Notes consist of the following: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As of March 31, 2023 | | As of December 31, 2022 | | 2023 Notes | | 2026 Notes | | 2025 Notes | | 2023 Notes | | 2026 Notes | | 2025 Notes | | Principal | $ | — | | | $ | 303,995 | | | $ | 191,000 | | | $ | 10,908 | | | $ | 316,250 | | | $ | 350,000 | | | | | | | | | | | | | | | Unamortized debt issuance costs | — | | | (4,072) | | | (1,945) | | | (5) | | | (4,563) | | | (3,898) | | | Net carrying amount | $ | — | | | $ | 299,923 | | | $ | 189,055 | | | $ | 10,903 | | | $ | 311,687 | | | $ | 346,102 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| Schedule of Interest Expense |
The following table sets forth total interest expense recognized related to the 2023, 2026 and 2025 Notes: | | | | | | | | | | | | | | | | | | | | | Three Months Ended March 31, | | | | | 2023 | | 2022 | | | | | | Contractual interest expense | | $ | 703 | | | $ | 723 | | | | | | | Amortization of debt issuance costs | | 618 | | | 676 | | | | | | | | | | | | | | | | Total | | $ | 1,321 | | | $ | 1,399 | | | | | |
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