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

9 Months Ended

Sep. 30, 2017

Interest expense related to the 2022 Notes is as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	(in thousands)				(in thousands)
Contractual interest expense	$	250	$	—	$	390	$	—
Amortization of debt discount		4,465		—		6,963		—
Amortization of issuance costs		334		—		519		—
Total interest expense	$	5,049	$	—	$	7,872	$	—

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 September 30, 2017			As of December 31, 2016
	(in thousands)
Debt discount for conversion option	$	106,006			—
Issuance costs		(2,854	)		—
Net carrying amount	$	103,152		$	—