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Inventories
 6 Months Ended
Jun. 30, 2018
Inventories  
Inventories

 

4. Inventories

 

Inventories consist of the following, in thousands of dollars:

 

 

 

June 30,

 

December 31,

 

 

 

2018

 

2017

 

 

 

(unaudited)

 

 

 

Raw materials

 

$
2,914

 

$
2,995

 

Work in process

 
6,142

 
8,873

 

Finished goods

 
11,624

 
4,436

 

 

 

 

 

 

 

 

 

$
20,680

 

$
16,304