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Debt (Tables)
3 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Schedule of debt obligation for borrowings
The net debt obligation for borrowings made under the Loan and Security Agreement was as follows (in thousands of dollars):
 
 March 31, 2020December 31, 2019
Debt principal$100  $100  
End-of-term debt obligation648  594  
Net debt obligation$748  $694