Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt

Schedule of outstanding convertible note balances

Our outstanding Convertible Note balances as December 31, 2014 consisted of the following (in thousands):

	December 31, 2014
Liability component:
Principal	$	200,000
Less: debt discount, net		(32,559	)
Net carrying amount	$	167,441
Equity component	$	38,188

Schedule of total interest expense recognized related to the Convertible Notes

The following table sets forth total interest expense recognized related to the Convertible Notes during the year ended December 31, 2014 (in thousands):

	Year Ended December 31, 2014
Contractual interest expense	$	4,375
Amortization of debt issuance costs		800
Amortization of debt discount		5,629
Total interest expense	$	10,804

Schedule of Future annual principal payments on long-term debt

Future annual principal payments on our long-term debt as of December 31, 2014 were as follows:

2015	$	34,000
2016		51,000
2017		51,000
2018		51,000
2019		51,000
Thereafter		102,000
Total	$	340,000