Convertible Senior Notes and Capped Call Transactions (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31, 2019
Principal	$	230,000
Unamortized discount	(52,173		)
Unamortized issuance costs	(6,533		)
Net carrying amount	$	171,294

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

	As of March 31, 2019
Proceeds allocated to the conversion options (debt discount)	$	52,900
Issuance costs	(1,986		)
Net carrying amount	$	50,914

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

	Three Months Ended March 31, 2019
Contractual interest expense	$	144
Amortization of issuance costs	116
Amortization of debt discount	727
Total interest expense	$	987