Debt (Tables)

6 Months Ended

Jun. 30, 2018

The Term Loan consisted of the following at June 30, 2018 and December 31, 2017 (in thousands):



	June 30, 2018			December 31, 2017
Principal	$	48,000		$	48,000
Less: unamortized debt discount and debt issuance costs	(3,199		)	(3,945		)
Net carrying amount	$	44,801		$	44,055

Interest Expense Summary

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Contractual interest expense	$	1,445	$	1,650	$	2,891	$	3,300
Amortization of debt discount	1,955		2,243		3,911		4,460
Amortization of debt issuance costs	115		132		229		263
Total interest expense	$	3,515	$	4,025	$	7,031	$	8,023

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



	Three Months Ended June 30, 2018		Six Months Ended June 30, 2018
Contractual interest expense	$	1,173	$	2,267
Amortization of debt discount	333		666
Amortization of debt issuance costs	40		80
Total interest expense	$	1,546	$	3,013

Convertible Debt

The Convertible Notes consisted of the following at June 30, 2018 and December 31, 2017 (in thousands):



	June 30, 2018			December 31, 2017
Liability component:
Principal	$	105,125		$	105,125
Less: unamortized debt discount and debt issuance costs	(16,212		)	(20,352		)
Net carrying amount	$	88,913		$	84,773
Equity component	$	41,905		$	41,905