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Convertible Notes (Details 2) - Convertible senior notes - 1.375% Convertible senior notes due 2023 - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Interest expense related to notes |  |  |  |
Convertible notes, stated interest rate (as a percentage) | 1.375% | 1.375% | 1.375% | 1.375%
Coupon interest expense | $ 0 | $ 169 | $ 12 | $ 485
Amortization of debt issuance costs | 0 | 46 | 3 | 151
Interest Expense, Other Long-Term Debt | $ 0 | $ 215 | $ 15 | $ 636

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