Convertible Senior Notes (Tables)

3 Months Ended

Mar. 31, 2022

Carrying Value of Convertible Senior Notes

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

	March 31,			December 31,
	2022			2021
	(Amounts in thousands)
0.375% convertible senior notes due 2024:
Principal amount	$	287,485		$	287,489
Unamortized debt discount		—			(28,220	)
Unamortized debt issuance costs		(4,218	)		(4,011	)
Net carrying amount	$	283,267		$	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
	March 31,
	2022			2021
	(Amounts in thousands)
Contractual interest expense	$	270		$	270
Amortization of debt issuance costs		452			352
Amortization of debt discount		—			2,478
Total	$	722		$	3,100
Effective interest rate of the liability component		0.3	%		1.2	%