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Inventories
 9 Months Ended
Sep. 30, 2018
Inventories  
Inventories

4.  Inventories

 

Inventories consist of the following, in thousands of dollars:

 

 

 

 

 

 

 

 

 

    

September 30,

    

December 31,

 

 

2018

 

2017

 

 

(unaudited)

 

 

 

Raw materials

 

$

3,925

 

$

2,995

Work in process

 

 

9,321

 

 

8,873

Finished goods

 

 

10,034

 

 

4,436

 

 

$

23,280

 

$

16,304