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Convertible Senior Notes (Tables)

9 Months Ended

Oct. 31, 2018

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



	October 31, 2018
Principal	$	300,000
Unamortized debt discount	(80,197		)
Unamortized debt issuance costs	(6,111		)
Net carrying amount	$	213,692

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



	October 31, 2018
Debt discount for conversion option	$	84,168
Issuance costs	(2,485		)
Net carrying amount	$	81,683

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



	Three Months Ended October 31,				Nine Months Ended October 31,
	2018		2017		2018		2017
Contractual interest expense	$	563	$	—	$	763	$	—
Amortization of debt discount	2,938		—		3,971		—
Amortization of issuance costs	174		—		234		—
Total	$	3,675	$	—	$	4,968	$	—