0.5% Convertible Senior Notes and Capped Call (Tables)

3 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Summary of Convertible Debt

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

	June 30, 2019			March 31, 2019
Principal	$	500,250		$	500,250
Unamortized debt discount	(81,598		)	(86,374		)
Unamortized issuance costs	(7,550		)	(7,939		)
Net carrying amount	$	411,102		$	405,937

Summary of Interest Expense

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

	Three Months Ended June 30,
	2019		2018
Amortization of debt discount	$	4,776	2,174
Amortization of issuance costs	389		167
Contractual interest expense	625		299
Total interest expense	$	5,790	2,640