Convertible Senior Notes and Capped Call Transactions (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Schedule of Carrying Amount of Liability Component of Convertible Debt

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

	September 30, 2021		December 31, 2020
	(In thousands)
Principal	$	747,500	$	747,500
Unamortized discount	(171,500)		(196,269)
Unamortized issuance costs	(10,941)		(12,799)
Net carrying amount	$	565,059	$	538,432

Schedule of Carrying Amount of Equity Component of Convertible Debt

The net carrying amount of the equity component of the Notes was as follows:

	September 30, 2021
	(In thousands)
Proceeds allocated to the conversion options (debt discount)	$	215,434
Issuance costs	(5,783)
Net carrying amount	$	209,651

Schedule of Interest Expense Incurred

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
	(In thousands)
Contractual interest expense	$	431	$	431	$	1,294	$	1,294
Amortization of issuance costs	630		308		1,858		908
Amortization of debt discount	8,396		2,450		24,770		7,227
Total interest expense	$	9,457	$	3,189	$	27,922	$	9,429