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Convertible Notes (Interest Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Nov. 17, 2017
Interest expense related to notes |  |  |  |
Amortization of discount and debt issuance costs | $ 3 | $ 207 | $ 7,656 |
Convertible senior notes | 1.375% Convertible senior notes due 2023 |  |  |  |
Interest expense related to notes |  |  |  |
Convertible notes, stated interest rate (as a percentage) | 1.375% | 1.375% | 1.375% | 1.375%
Coupon interest expense |  | $ 610 | $ 2,372 |
Amortization of discount and debt issuance costs |  | 194 | 7,656 |
Total interest expense on convertible notes |  | $ 804 | $ 10,028 |

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