Convertible Senior Notes (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Components of Convertible Senior Notes

The Notes consist of the following (in thousands):

	for the period
	June 30, 2018			December 31, 2017
Liability component:
Principal	$	115,000		$	115,000
Less: debt discount, net of amortization		(23,245	)		(25,519	)
Net carrying amount	$	91,755		$	89,481
Equity component (a)		22,094			22,094

a)	Recorded in the consolidated balance sheet within additional paid-in capital, net of $0.8 million transaction costs in equity as of December 31, 2017.

Summary of Total Interest Expense Recognized Related To Convertible Senior Notes

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

	As of
	June 30, 2018		December 31, 2017
1.50% coupon	$	868	$	192
Amortization of debt discount and transaction costs		2,274		499
	$	3,142	$	691

Summary of Fair Value and Carrying Value of Convertible Senior Notes

As of June 30, 2018 and December 31, 2017, the fair value of the Notes, which was determined based on inputs that are observable in the market or that could be derived from, or corroborated with, observable market data, quoted price of the Notes in an over-the-counter market (Level 2), and carrying value of debt instruments (carrying value excludes the equity component of the Company’s convertible notes classified in equity) were as follows (in thousands):

	June 30, 2018				December 31, 2017
	Fair Value		Carrying Value		Fair Value		Carrying Value
Convertible senior notes	$	163,615	$	91,755	$	126,931	$	89,481