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0.25% Convertible Senior Notes, Convertible Note Hedge and Warrant (Tables)

12 Months Ended

Dec. 31, 2018

Interest expense related to the 2022 Notes is as follows:

	Year Ended December 31,
	2018		2017		2016
	(in thousands)
Contractual interest expense	$	1,000	$	639	$	—
Amortization of debt discount		18,923		11,507		—
Amortization of issuance costs		1,412		859		—
Total interest expense	$	21,335	$	13,005	$	—

The net equity impact, included in additional paid-in capital, of the above components of the 2022 Notes is as follows:

	(in thousands)
Conversion Option	$	106,006
Purchase of Convertible Note Hedges		(78,920	)
Sales of warrants		59,080
Issuance costs		(3,054	)
Deferred tax liability		(9,399	)
Total	$	73,713

The net carrying amount of the liability component of the 2022 Notes is as follows:

The net carrying amount of the equity component of the 2022 Notes is as follows:

	As of December 31, 2018			As of December 31, 2017
	(in thousands)
Debt discount for conversion option	$	106,006			106,006
Issuance costs		(2,854	)		(2,854	)
Net carrying amount	$	103,152		$	103,152