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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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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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