Notes Payable (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of redemption price as percentage of outstanding principal balance


	Redemption
Payment Dates	Percentage
From and including March 15, 2018 to and including March 14, 2019	108.00	%
From and including March 15, 2019 to and including March 14, 2020	105.50	%
From and including March 15, 2020 to and including March 14, 2021	102.75	%
From and including March 15, 2021 and thereafter	100.00	%

Schedule of outstanding Convertible Note

The Company’s outstanding Convertible Note balances as of June 30, 2018 and December 31, 2017 consisted of the following (in thousands):


	June 30, 2018		December 31, 2017
Liability component:
Principal	$	335,699	$	335,699
Less: unamortized debt discount		(72,980)		(80,530)
Less: unamortized debt issuance costs		(5,513)		(5,976)
Net carrying amount	$	257,206	$	249,193
Equity component	$	114,199	$	114,199

Schedule of interest expense related to Convertible Notes

The following table sets forth total interest expense recognized related to the 2022 Notes during the three and six months ended June 30, 2018 and 2017 (in thousands):


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Contractual interest expense	$	1,888	$	1,888	$	3,777	$	3,777
Amortization of debt issuance costs		237		196		464		383
Amortization of debt discount		3,816		3,497		7,550		6,918
Total interest expense	$	5,941	$	5,581	$	11,791	$	11,078