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Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2021

The net carrying amount of the liability and equity components of the Notes was as follows (in thousands):


	September 30, 2021		December 31, 2020
Liability component:
Principal	$	345,000	$	345,000
Unamortized discount	(43,255)		(49,346)
Unamortized issuance costs	(5,404)		(6,164)
Net carrying amount	$	296,341	$	289,490

Equity component, net of purchase discounts and issuance costs	$	58,560	$	58,560

Interest expense related to the Notes is as follows (in thousands):


	Three months ended September 30,				Nine months ended September 30,
	2021		2020		2021		2020
Contractual interest expense	$	970	$	970	$	2,911	$	2,910
Amortization of debt discount	2,045		1,983		6,091		5,903
Amortization of issuance costs	256		248		760		738
Total interest expense	$	3,271	$	3,201	$	9,762	$	9,551