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Debt (Tables)
6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Schedule of debt obligation for borrowings
he net debt obligation for borrowings made under the Loan and Security Agreement was as follows (in thousands of dollars):
 
 
June 30, 2019
 
December 31, 2018
Debt principal
$
100

 
$
25,000

End-of-term debt obligation
485

 
365

Unamortized debt issuance costs

 
(83
)
Net debt obligation
$
585

 
$
25,282