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Inventories
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consist of the following, in thousands of dollars:
 
June 30,
2019
 
December 31,
2018
 
(unaudited)
 
 
Raw materials
$
4,953

 
$
5,742

Work in process
7,527

 
7,275

Finished goods
13,544

 
12,642

Total
$
26,024

 
$
25,659