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Convertible Notes (Details 2) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Interest expense related to notes |  |
Amortization of discount and debt issuance costs | $ 1,773 | $ 1,678
Interest expense | 2,555 | 2,271
Convertible senior notes | 1.375% Convertible senior notes due 2023 |  |
Interest expense related to notes |  |
Interest | 593 | 593
Amortization of discount and debt issuance costs | 1,773 | 1,678
Interest expense | $ 2,366 | $ 2,271
Convertible notes stated interest rate (as a percentage) | 1.375% | 1.375%
Effective interest rate of the liability component (as a percentage) | 4.90% | 4.90%

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