Debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt

Debt at December 31, 2015, consisted of the following (in thousands):

	December 31, 2015
	Principal			Unamortized Discount			Net Carrying Value
Loan and Security Agreement	$	20,000		$	(128	)	$	19,872
Less: debt—current		(3,050	)		61			(2,989	)
Debt—non-current	$	16,950		$	(67	)	$	16,883

Debt at December 31, 2014, consisted of the following (in thousands):

	December 31, 2014
	Principal		Unamortized Discount			Total
Loan and Security Agreement	$	10,000	$	(128	)	$	9,872
Less: debt—current		—		—			—
Debt—non-current	$	10,000	$	(128	)	$	9,872

Expected Principal and Interest Payments on Debt

Principal and interest payments on debt at December 31, 2015, are expected to be as follows*:

Year ended December 31,	Principal		Interest		Total
2016		3,050		1,352		4,402
2017		6,428		980		7,408
2018		6,892		517		7,409
2019		3,630		1,474		5,104
Total	$	20,000	$	4,323	$	24,323

* Unless interest only period extends to December 31, 2016, as described below.