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Inventory
 3 Months Ended
Mar. 31, 2019
Inventory  
Inventory

4.  Inventory

 

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

 

 

 

 

 

 

 

 

 

 

    

March 31,

    

December 31,

 

 

 

2019

 

2018

 

Raw materials and supplies - production locations

 

$

39,834

 

$

32,941

 

Raw materials and supplies - customer locations

 

 

7,401

 

 

6,755

 

Work-in-process

 

 

11,992

 

 

5,589

 

Finished goods

 

 

6,247

 

 

2,625

 

Inventory

 

$

65,474

 

$

47,910