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Convertible Notes (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Interest expense related to notes |  |  |  |
Amortization of discount and debt issuance costs |  |  | $ 151 | $ 3,775
Interest expense | $ 348 | $ 2,683 | $ 953 | $ 5,297
1.375% Convertible senior notes due 2023 | Convertible senior notes |  |  |  |
Interest expense related to notes |  |  |  |
Convertible notes, stated interest rate (as a percentage) | 1.375% | 1.375% | 1.375% | 1.375%
Coupon interest expense | $ 169 | $ 593 | $ 485 | $ 1,186
Amortization of discount and debt issuance costs | 46 | 1,901 | 151 | 3,775
Interest expense | $ 215 | $ 2,494 | $ 636 | $ 4,961

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