Debt (Tables)

9 Months Ended

Sep. 30, 2015

Debt

Schedule of net debt obligation

As of September 30, 2015 and December 31, 2014, the net debt obligation was as follows (in thousands):

	September 30,			December 31,
	2015			2014
Debt and unpaid accrued end-of-term payment	$	5,062		$	5,003
Unamortized note discount	(60		)	(80		)
Net debt obligation	$	5,002		$	4,923

Schedule of future principal payments under the Amended Loan

Future principal payments under the Amended Loan are as follows (in thousands):

Year Ending December 31,	Amounts
October through December 31, 2015	$	—
2016	—
2017	2,437
2018	2,563
Total	$	5,000

Schedule of interest expense on debt

Interest expense on the debt was as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Nominal interest	$	64	$	78	$	189	$	230
Amortization of debt discount	7		16		20		48
End-of-term payment	21		20		60		60
Total	$	92	$	114	$	269	$	338