Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2022

Carrying Value of Convertible Senior Notes

The net carrying value of the liability component of the 2019 Notes is as follows:

	September 30, 2022			December 31, 2021
	(Amounts in thousands)
0.375% Convertible Senior Notes due 2024:
Principal amount	$	287,475		$	287,489
Unamortized debt discount		—			(28,220	)
Unamortized debt issuance costs		(3,310	)		(4,011	)
Net carrying amount	$	284,165		$	255,258

Schedule of convertiable note interest expense

The following table sets forth total interest expense recognized related to the 2019 Notes:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
	(Amounts in thousands)
Contractual interest expense	$	270		$	270		$	809		$	809
Amortization of debt issuance costs		455			361			1,360			1,070
Amortization of debt discount		—			2,540			—			7,526
Total	$	725		$	3,171		$	2,169		$	9,405
Effective interest rate of the liability component		1.0	%		5.1	%		1.0	%		5.1	%