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Convertible Notes (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Interest expense related to notes |  |  |  |
Amortization of discount and debt issuance costs |  |  | $ 3,571 | $ 3,379
Interest expense | $ 2,580 | $ 2,534 | 5,135 | 4,805
Convertible senior notes | 1.375% Convertible senior notes due 2023 |  |  |  |
Interest expense related to notes |  |  |  |
Interest | 593 | 593 | 1,186 | 1,186
Amortization of discount and debt issuance costs | 1,798 | 1,701 | 3,571 | 3,379
Interest expense | $ 2,391 | $ 2,294 | $ 4,757 | $ 4,565
Convertible notes, stated interest rate (as a percentage) | 1.375% | 1.375% | 1.375% | 1.375%
Effective interest rate of the liability component (as a percentage) | 4.90% | 4.90% | 4.90% | 4.90%

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