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Other Expenses
 3 Months Ended
Mar. 31, 2019
Other Expenses  
Other Expenses

10.  Other Expenses

 

Other expenses consist of the following, in thousands of dollars:

 

 

 

 

 

 

 

 

 

 

Three Months ended March 31,

 

    

2019

    

2018

 

    

(unaudited)

Interest income

 

$

4,681

 

$

1,206

Interest expense

 

 

(4,710)

 

 

(717)

Interest expense-nonrecourse liability related to sale of future royalties

 

 

(1,160)

 

 

(701)

Total

 

$

(1,189)

 

$

(212)

 

Interest expense includes non-cash interest expense relates to amortization of deferred financing costs and debt discount in the amount of $3.8 million and $0.6 million for the three month periods ended March 31, 2019 and 2018, respectively.