Debt (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Schedule of convertible debt obligations

The Company’s outstanding debt obligations as of September 30, 2021 and December 31, 2020 were as follows: 

	September 30,		December 31,
	2021		2020
	(in thousands)
Revolving credit facility balance	$	—	$	—
Convertible Notes due 2023	$	345,000	$	345,000
Unamortized issuance costs on Convertible Notes due 2023	(3,491)		(4,306)
Unaccreted discount on Convertible Notes due 2023	—		(24,058)
Convertible Notes due 2023 carrying value	$	341,509	$	316,636
Convertible Notes due 2025	$	517,500	$	517,500
Unamortized issuance costs on Convertible Notes due 2025	(11,376)		(11,731)
Unaccreted discount on Convertible Notes due 2025	—		(65,902)
Convertible Notes due 2025 carrying value	$	506,124	$	439,867

Schedule of interest expense

Interest expense was comprised of the following and is included in other expense, net in the condensed consolidated statements of operations:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
	(in thousands)
Coupon interest	$	2,479	$	1,951	$	7,439	$	4,962
Amortization of issuance costs	1,443		922		4,295		2,186
Undrawn and other fees	320		191		948		477
Interest on revolving credit facility	—		1,259		—		5,786
Accretion of debt discount	—		3,816		—		8,496
Total interest expense	$	4,242	$	8,139	$	12,682	$	21,907