Convertible Senior Notes (Tables)

6 Months Ended

Jun. 30, 2022

Carrying Value of Convertible Senior Notes

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

	June 30,			December 31,
	2022			2021
	(Amounts in thousands)
0.375% Convertible Senior Notes due 2024:
Principal amount	$	287,476		$	287,489
Unamortized debt discount		—			(28,220	)
Unamortized debt issuance costs		(3,764	)		(4,011	)
Net carrying amount	$	283,712		$	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						Six Months Ended
	June 30,						June 30,
	2022			2021			2022			2021
	(Amounts in thousands)
Contractual interest expense	$	269		$	269		$	539		$	539
Amortization of debt issuance costs		453			357			905			709
Amortization of debt discount		—			2,508			—			4,986
Total	$	722		$	3,134		$	1,444		$	6,234
Effective interest rate of the liability component		1.0	%		5.1	%		1.0	%		5.1	%