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Convertible Notes (Interest Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Nov. 17, 2017
Interest expense related to notes
Amortization of discount and debt issuance costs	$ 3	$ 207	$ 7,656
Convertible senior notes | 1.375% Convertible senior notes due 2023
Interest expense related to notes
Convertible notes, stated interest rate (as a percentage)	1.375%	1.375%	1.375%	1.375%
Coupon interest expense		$ 610	$ 2,372
Amortization of discount and debt issuance costs		194	7,656
Total interest expense on convertible notes		$ 804	$ 10,028

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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