Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Debt

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

	June 30, 2018
	Principal			Unamortized Discount			Total
Loan and Security Agreement	$	30,000		$	(166	)	$	29,834
Less: debt - current		(3,572	)		—			(3,572	)
Debt - non-current	$	26,428		$	(166	)	$	26,262

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 June 30, 2018, are expected to be as follows (in thousands):