Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Debt

Debt at September 30, 2018, consisted of the following (in thousands):

	September 30, 2018
	Principal			Unamortized Discount			Total
Loan and Security Agreement	$	30,000		$	(148	)	$	29,852
Less: debt – current		(5,714	)		—			(5,714	)
Debt – non-current	$	24,286		$	(148	)	$	24,138

Debt at December 31, 2017, consisted of the following (in thousands):

	December 31, 2017
	Principal		Unamortized Discount			Net Carrying Value
Loan and Security Agreement	$	30,000	$	(202	)	$	29,798
Less: debt – current		—		—			—
Debt – non-current	$	30,000	$	(202	)	$	29,798

Expected Principal and Interest Payments on Debt

Principal and interest payments on debt at September 30, 2018, are expected to be as follows (in thousands):

Year ended December 31,	Principal		Interest		Total
2018	$	—	$	689	$	689
2019		7,857		2,470		10,327
2020		8,571		1,689		10,260
2021		8,572		891		9,463
2022		5,000		2,554		7,554
Total	$	30,000	$	8,293	$	38,293