Convertible Senior Notes and Capped Call Transactions (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Schedule of Net Carrying Amount of Liability and Equity Components of Convertible Notes

The net carrying amount of the liability and equity components of the 2025 Notes was as follows (in thousands):

	September 30, 2021
	(unaudited)
Liability component
Principal	$	253,000
Unamortized discount	(24,196)
Unamortized issuance costs	(5,220)
Net carrying amount	$	223,584
Equity component, net of discount and issuance costs	$	30,794

Schedule of Interest Expense

The interest expense recognized related to the 2025 Notes for the three and nine months ended September 30, 2021 and 2020 was as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(unaudited)				(unaudited)
Contractual interest expense	$	792	$	791	$	2,372	$	1,221
Amortization of debt discount	1,420		1,354		4,214		1,996
Amortization of debt issuance costs	306		292		909		430
Total	$	2,518	$	2,437	$	7,495	$	3,647