Debt (Tables)

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Schedule of Convertible Debt

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

	September 30, 2020
	(in thousands)
Principal	$	575,000
Unamortized debt discount	(193,034)
Unamortized debt issuance costs	(7,455)
Carrying amount of the liability component, net	$	374,511

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

	September 30, 2020
	(in thousands)
Proceeds allocated to the conversion option (debt discount)	$	205,290
Less: allocated issuance costs	(4,478)
Carrying amount of the equity component, net	$	200,812

Schedule of Interest Expense

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
	(in thousands)
Coupon interest expense	$	1,078	$	—	$	1,629	$	—
Amortization of debt discount	$	8,159	$	—	$	12,256	$	—
Amortization of debt issuance costs	$	403	$	—	$	609	$	—
Total	$	9,640	$	—	$	14,494	$	—