Convertible Senior Notes (Tables)

6 Months Ended

Jun. 30, 2022

0.375%Convertible Senior Notes Due 2025 as Liability Component [Member]

Debt Instrument [Line Items]

Schedule of Net Carrying Amount of Notes

The net carrying amount of the liability component of the 2025 Notes is as follows:
 

	As of June 30, 2022			As of December 31, 2021
	(in thousands)
Principal	$	459,083		$	459,999
Unamortized debt discount		—			(70,594	)
Unamortized issuance costs		(5,851	)		(5,544	)
Net carrying amount	$	453,232		$	383,861

0.375% Convertible Senior Notes Due 2025 [Member]

Debt Instrument [Line Items]

Schedule of Interest Expense

Interest expense related to the 2025 Notes is as follows:
 

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
	(in thousands)
Contractual interest expense	$	430	$	431	$	861	$	862
Amortization of debt discount		—		4,510		—		8,901
Amortization of issuance costs		492		354		973		699
Total interest expense	$	922	$	5,295	$	1,834	$	10,462

2025

Debt Instrument [Line Items]

Schedule of Interest Expense

Interest expense related to the 2022 Notes is as follows:
 

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
	(in thousands)				(in thousands)
Contractual interest expense	$	8	$	46	$	20	$	115
Amortization of debt discount		—		1,074		—		2,709
Amortization of issuance costs		18		80		44		203
Total interest expense	$	26	$	1,200	$	64	$	3,027