Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Term Loan

The Term Loan consists of the following (in thousands):

	September 30, 2019			December 31, 2018
Principal	$	47,500		$	47,500
Less: unamortized debt discount and debt issuance costs	(1,335		)	(2,454		)
Net carrying amount	$	46,165		$	45,046

Interest Expense Summary

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Contractual interest expense	$	1,225	$	1,185	$	3,615	$	3,452
Amortization of debt discount	333		332		999		998
Amortization of debt issuance costs	40		40		120		120
Total interest expense	$	1,598	$	1,557	$	4,734	$	4,570

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Contractual interest expense	$	1,446	$	1,446	$	4,337	$	4,337
Amortization of debt discount	1,955		1,955		5,866		5,866
Amortization of debt issuance costs	115		115		344		344
Total interest expense	$	3,516	$	3,516	$	10,547	$	10,547

Convertible Debt

The Convertible Notes consist of the following (in thousands):

	September 30, 2019			December 31, 2018
Liability component:
Principal	$	105,125		$	105,125
Less: unamortized debt discount and debt issuance costs	(5,861		)	(12,071		)
Net carrying amount	$	99,264		$	93,054
Equity component	$	41,905		$	41,905