Debt (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Schedule of Convertible Debt Obligations

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

	December 31,
	2021		2020
	(in thousands)
Revolving credit facility balance	$	—	$	—
Convertible Notes due 2023	$	345,000	$	345,000
Unaccreted discount on Convertible Notes due 2023	—		(24,058)
Unamortized issuance costs on Convertible Notes due 2023	(2,979)		(4,306)
Convertible Notes due 2023 carrying value	$	342,021	$	316,636
Convertible Notes due 2025	$	517,500	$	517,500
Unaccreted discount on Convertible Notes due 2025	—		(65,902)
Unamortized issuance costs on Convertible Notes due 2025	(10,659)		(11,731)
Convertible Notes due 2025 carrying value	$	506,841	$	439,867

Schedule of Interest Expense

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

	Year Ended December 31,
	2021		2020		2019
	(in thousands)
Coupon interest	$	9,919	$	7,442	$	8,917
Amortization of issuance costs	5,745		3,396		3,703
Undrawn and other fees	1,267		796		795
Accretion of debt discount	—		14,084		15,040
Interest on revolving credit facility	—		5,786		4,065
Total interest expense	$	16,931	$	31,504	$	32,520