Unsecured Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2022

Debt Instrument [Line Items]

Summary of unsecured convertible senior notes outstanding

	Balance as of September 30, 2022
	2023 Notes		2026 Notes		Total
	(In thousands)
Principal amount	$	95,000	$	225,030	$	320,030
Unamortized debt issuance costs		(789)		(4,422)		(5,211)
Total unsecured convertible senior notes, net	$	94,211	$	220,608	$	314,819
Fair value of outstanding unsecured convertible senior notes (1)	$	88,113	$	132,543

	Balance as of December 31, 2021
	2023 Notes		2026 Notes		Total
	(In thousands)
Principal amount	$	95,000	$	225,030	$	320,030
Unamortized discount		(1,282)		(5,290)		(6,572)
Total unsecured convertible senior notes, net	$	93,718	$	219,740	$	313,458
Fair value of outstanding unsecured convertible senior notes (1)	$	87,163	$	171,867

(1) The fair value is classified as Level 3 due to the limited trading activity for the unsecured convertible senior notes.

Schedule of future minimum payments of debt

	(In thousands)
2023	$	95,000
2024		—
2025		—
2026		225,030
2027		—
Total future minimum principal payments under the 2023 Notes and 2026 Notes	$	320,030

2023 Unsecured Convertible Senior Notes

Debt Instrument [Line Items]

Schedule of total interest expense recognized

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)				(In thousands)
Contractual interest expense	$	1,484	$	1,484	$	4,453	$	4,453
Amortization of debt issuance costs		167		156		493		459
Total	$	1,651	$	1,640	$	4,946	$	4,912

2026 Unsecured Convertible Senior Notes

Debt Instrument [Line Items]

Schedule of total interest expense recognized

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)				(In thousands)
Contractual interest expense	$	2,954	$	2,954	$	8,861	$	8,861
Amortization of debt issuance costs		294		277		869		797
Total	$	3,248	$	3,231	$	9,730	$	9,658