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Inventory
 12 Months Ended
Dec. 31, 2019
Inventory  
Inventory

4.  Inventory

 

Inventory as of December 31, 2019 and 2018 consists of the following (in thousands):

 

 

 

 

 

 

 

 

 

    

December 31, 2019

    

December 31, 2018

Raw materials and supplies - production locations

 

$

48,011

 

$

32,941

Raw materials and supplies - customer locations

 

 

9,241

 

 

6,755

Work-in-process

 

 

12,529

 

 

5,589

Finished goods

 

 

2,610

 

 

2,625

Inventory

 

$

72,391

 

$

47,910