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Convertible Notes (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest expense related to notes
Amortization of discount and debt issuance costs			$ 3,775	$ 3,571
Interest expense	$ 2,683	$ 2,580	5,297	5,135
Convertible senior notes | 1.375% Convertible senior notes due 2023
Interest expense related to notes
Coupon interest expense	593	593	1,186	1,186
Amortization of discount and debt issuance costs	1,901	1,798	3,775	3,571
Interest expense	$ 2,494	$ 2,391	$ 4,961	$ 4,757
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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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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