Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2024

Debt Instrument [Line Items]

Carrying Value of Convertible Senior Notes

The carrying value of the Company's Convertible Senior Notes is as follows:

	September 30, 2024			December 31, 2023
	(Amounts in thousands)
1.00% Convertible Senior Notes due 2028:
Principal amount	$	600,000		$	600,000
Unamortized debt discount		(71,261	)		(81,457	)
Unamortized debt issuance costs		(7,132	)		(8,400	)
Carrying amount - Convertible Senior Notes due 2028, net	$	521,607		$	510,143
0.375% Convertible Senior Notes due 2024:
Principal amount	$	—		$	69,700
Unamortized debt issuance costs		—			(248	)
Carrying amount - Convertible Senior Notes due 2024, net	$	—		$	69,452

2023 Notes

Debt Instrument [Line Items]

Schedule of convertible note interest expense

The following table sets forth total interest expense recognized related to the 2023 Notes for the three and nine months ended September 30, 2024 for which there were no comparable amounts for the same periods of 2023:

	Three Months Ended September 30,			Nine Months Ended September 30,
	2024			2024
	(Amounts in thousands, except percentage data)
Contractual interest expense – 2023 Notes	$	1,500		$	4,500
Amortization of debt discount – 2023 Notes		3,473			10,197
Amortization of debt issuance costs – 2023 Notes		410			1,190
Total	$	5,383		$	15,887
Effective interest rate of the liability component		4.39	%		4.39	%

2019 Notes

Debt Instrument [Line Items]

Schedule of convertible 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,
	2024			2023			2024			2023
	(Amounts in thousands, except percentage data)
Contractual interest expense – 2019 Notes	$	11		$	269		$	141		$	808
Amortization of debt issuance costs – 2019 Notes		19			459			243			1,373
Total	$	30		$	728		$	384		$	2,181
Effective interest rate of the liability component		1.00	%		1.00	%		1.00	%		1.00	%