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PREPAID EXPENSES AND OTHER ASSETS
9 Months Ended
Sep. 30, 2017
PREPAID EXPENSES AND OTHER ASSETS [Abstract]  
PREPAID EXPENSES AND OTHER ASSETS
4. PREPAID EXPENSES AND OTHER ASSETS

Prepaid expenses and other assets consisted of the following:

  
September 30, 2017
  
December 31, 2016
 
  
(thousands of dollars)
 
Prepaid license
 
$
1,919
  
$
1,919
 
Prepaid catalyst
  
55
   
187
 
Prepaid insurance
  
255
   
797
 
Other prepaid expenses and assets
  
1,047
   
608
 
    Total
 
$
3,276
  
$
3,511