Convertible Senior Notes and Capped Call Transactions (Tables)

6 Months Ended

Jun. 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:

	June 30, 2021		December 31, 2020
	(In thousands)
Principal	$	747,500	$	747,500
Unamortized discount	(179,896)		(196,269)
Unamortized issuance costs	(11,572)		(12,799)
Net carrying amount	$	556,032	$	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:

	June 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				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(In thousands)
Contractual interest expense	$	432	$	431	$	863	$	863
Amortization of issuance costs	619		303		1,228		600
Amortization of debt discount	8,256		2,409		16,374		4,776
Total interest expense	$	9,307	$	3,143	$	18,465	$	6,239