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Convertible Senior Notes - Components (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | May 31, 2020 | May 29, 2020 | May 18, 2020 | Mar. 31, 2018
Convertible Senior Notes |  |  |  |  |  |  |  |
Unamortized debt discount | $ (1,600) |  |  |  |  |  |  |
Net carrying amount | 195,264 | $ 193,919 |  |  |  |  |  |
Conversion of convertible senior notes to common stock |  |  | $ 15,345 |  |  |  |  |
3.75% Convertible Senior Notes |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |
Principal amount | 197,278 | 197,278 |  |  | $ 212,463 | $ 12,500 | $ 200,000 |
Unamortized debt issuance costs | (2,014) | (3,359) |  |  |  |  |  |
Net carrying amount | 195,264 | 193,919 |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.75% | 3.75% | 3.75% | 3.75% | 3.75% | 3.75%
Conversion of convertible senior notes to common stock | $ 0 | $ 0 |  |  |  |  |  |

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