Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt

Debt at March 31, 2018, consisted of the following (in thousands):

	March 31, 2018
	Principal			Unamortized Discount			Total
Loan and Security Agreement	$	30,000		$	(184	)	$	29,816
Less: debt - current		(1,429	)		—			(1,429	)
Debt - non-current	$	28,571		$	(184	)	$	28,387

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 March 31, 2018, are expected to be as follows (in thousands):

Year ended December 31,	Principal		Interest		Total
2018	$	—	$	2,062	$	2,062
2019		7,857		2,447		10,304
2020		8,571		1,673		10,244
2021		8,572		882		9,454
2022		5,000		2,552		7,552
Total	$	30,000	$	9,616	$	39,616