Debt (Tables)

6 Months Ended

Jun. 30, 2022

Debt Instrument [Line Items]

Debt Outstanding Excluding Lease Obligations

Debt outstanding, excluding lease obligations, consists of the following:

	June 30, 2022							December 31, 2021
(In thousands)	Principal Balance		Unamortized Discount and Debt Issuance Costs		Net Carrying Amount			Principal Balance		Unamortized Discount and Debt Issuance Costs			Net Carrying Amount
0.875% Convertible Senior Notes (1)	$	207,911	$	4,104	$	203,807		$	167,853	$	(9,057	)	$	176,910
Senior Secured Credit Facility		0		3,912		(3,912	)		175,000		1,848			173,152
Total debt	$	207,911	$	8,016	$	199,895		$	342,853	$	(7,209	)	$	350,062

(1) As of June 30, 2022, the principal balance is recognized in debt. As of December 31, 2021, the principal balance is $207,911 thousand; $167,853 thousand is recognized in debt and $40,058 thousand is recognized in additional paid-in capital.

Interest Expense

Interest expense consists of the following:

	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2022		2021		2022		2021
Interest expense	$	1,084	$	1,079	$	2,590	$	2,367
Amortization of discounts and debt issuance costs		803		1,870		1,433		3,725
Total interest expense	$	1,887	$	2,949	$	4,023	$	6,092

Summary of Future Debt Payment Obligations

The following table summarizes future debt principal payment obligations as of June 30, 2022:

(In thousands)	Total		Remainder of 2022		2023		2024		2025		2026		Thereafter
0.875% Convertible Senior Notes (1)	$	207,911	$	0	$	0	$	0	$	0	$	0	$	207,911
Total debt	$	207,911	$	0	$	0	$	0	$	0	$	0	$	207,911

(1) Amount represents the face value of the 0.875% Convertible Senior Notes.