Debt (Tables)

3 Months Ended

Mar. 31, 2018

The Term Loan consisted of the following at March 31, 2018 and December 31, 2017 (in thousands):



	March 31, 2018			December 31, 2017
Principal	$	48,000		$	48,000
Less: unamortized debt discount and debt issuance costs	(3,572		)	(3,945		)
Net carrying amount	$	44,428		$	44,055

Interest Expense Summary

The following table sets forth total interest expense recognized related to the Convertible Notes during the three months ended March 31, 2018 and 2017 (in thousands):



	Three Months Ended March 31,
	2018		2017
Contractual interest expense	$	1,446	$	1,650
Amortization of debt discount	1,956		2,217
Amortization of debt issuance costs	114		131
Total interest expense	$	3,516	$	3,998

The following table sets forth total interest expense recognized related to the Term Loan during the three months ended March 31, 2018 (in thousands):



Contractual interest expense	$	1,094
Amortization of debt discount	333
Amortization of debt issuance costs	40
Total interest expense	$	1,467

Convertible Debt

The Convertible Notes consisted of the following at March 31, 2018 and December 31, 2017 (in thousands):



	March 31, 2018			December 31, 2017
Liability component:
Principal	$	105,125		$	105,125
Less: unamortized debt discount and debt issuance costs	(18,282		)	(20,352		)
Net carrying amount	$	86,843		$	84,773
Equity component	$	41,905		$	41,905