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Debt (Tables)
9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Schedule of debt obligation for borrowings
As of September 30, 2018, the net debt obligation for borrowings made under the Loan and Security Agreement was as follows (in thousands of dollars):
 
 
September 30, 2018
 
December 31, 2017
Debt principal
$
25,000

 
$
25,000

End-of-term debt obligation
283

 
53

Unamortized debt issuance costs
(91
)
 
(115
)
Net debt obligation
$
25,192

 
$
24,938

Schedule of debt obligation payments
Future principal and end-of-term debt obligation payments due under the Loan and Security Agreement are as follows (in thousands of dollars):
 
Year Ending December 31,
 
2019
$
1,389

2020
8,333

2021
8,333

2022
8,132

Total
$
26,187