Debt (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Debt

Debt at September 30, 2017, consisted of the following (in thousands):

	September 30, 2017
	Principal		Unamortized Discount			Total
Loan and Security Agreement	$	30,000	$	(220	)	$	29,780
Less: debt - current		—		—			—
Debt - non-current	$	30,000	$	(220	)	$	29,780

Debt at December 31, 2016, consisted of the following (in thousands):

	December 31, 2016
	Principal			Unamortized Discount			Net Carrying Value
Loan and Security Agreement	$	19,499		$	(124	)	$	19,375
Less: debt - current		(7,013	)		79			(6,934	)
Debt - non-current	$	12,486		$	(45	)	$	12,441

Expected Principal and Interest Payments on Debt

Principal and interest payments on debt at September 30, 2017, are expected to be as follows (in thousands):

Year ended December 31,	Principal		Interest		Total
2017	$	—	$	609	$	609
2018		—		2,445		2,445
2019		7,857		2,178		10,035
2020		8,571		1,489		10,060
2021		8,572		785		9,357
2022		5,000		2,535		7,535
Total	$	30,000	$	10,041	$	40,041