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Inventories (Tables)
 6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Components of Inventories

The components of inventories consisted of the following:

 

 

 

June 30,

 

 

December 31,

 

(in thousands)

 

2019

 

 

2018

 

Raw materials

 

$

12,594

 

 

$

12,368

 

Finished goods

 

 

8,710

 

 

 

4,261

 

Inventories

 

$

21,304

 

 

$

16,629