Debt (Tables)

6 Months Ended

Jun. 30, 2016

Debt Disclosure [Abstract]

Schedule of net debt obligation

As of June 30, 2016, the net debt obligation for borrowings made under the Credit Agreement was as follows (in thousands of dollars):

	June 30, 2016
Debt principal	$	25,192
Unamortized deferred debt issuance costs	(521		)
Net debt obligation	$	24,671

Schedule of future principal payments under the Credit agreement

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

Year Ending December 31,
2020	$	9,447
Thereafter	15,745
Total	$	25,192

Schedule of interest expense on debt

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Nominal interest	$	758	$	63	$	828	$	125
Amortization and write-off of debt discount and debt issuance costs	27		7		118		13
Prepayment penalty	—		—		50		—
End-of-term payment interest	—		20		156		39
Total	$	785	$	90	$	1,152	$	177