Convertible Senior Notes and Capped Call Transactions (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Schedule of Carrying Amount of Convertible Debt and Related Interest

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

	As of December 31, 2020		As of December 31, 2019
Principal	$	747,500	$	230,000
Unamortized discount	(196,269)		(45,295)
Unamortized issuance costs	(12,799)		(5,693)
Net carrying amount	$	538,432	$	179,012

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

	As of December 31, 2020		As of December 31, 2019
Proceeds allocated to the conversion options (debt discount)	$	215,434	$	52,900
Issuance costs	(5,783)		(1,986)
Net carrying amount	$	209,651	$	50,914

The following table sets forth the interest expense recognized related to the Notes (in thousands):

	For the Year Ended December 31, 2020		For the Year Ended December 31, 2019
Contractual interest expense	$	1,725	$	1,438
Amortization of issuance costs	1,340		956
Amortization of debt discount	11,564		7,605
Total interest expense	$	14,629	$	9,999