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Debt (Tables)

12 Months Ended

Dec. 31, 2016

Interest expense was as follows (in thousands of dollars):



	Year Ended December 31,
	2016		2015		2014
Nominal interest	$	2,378	$	253	$	296
Amortization and write-off of debt discount and debt issuance costs	173		46		62
End-of-term payment interest and prepayment penalty	206		79		81
Total	$	2,757	$	378	$	439

Future principal payments under the Credit Agreement are as follows (in thousands of dollars):

As of December 31, 2016, the net debt obligation for borrowings made under the Credit Agreement was as follows (in thousands of dollars):



	December 31, 2016
Debt principal	$	25,385
Unamortized debt issuance costs	(467		)
Net debt obligation	$	24,918

As of December 31, 2015, the net debt obligation under the Amended Loan was as follows (in thousands of dollars):




	2015
Debt and unpaid accrued end-of-term payment	$	5,082
Unamortized note discount	(92		)
Net debt obligation	$	4,990