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Inventory
 3 Months Ended
Mar. 31, 2017
Inventory Net [Abstract]  
Inventory

4. Inventory

Inventory consisted of the following at March 31, 2017 and December 31, 2016 (in thousands):

 

 

March 31,

 

 

December 31,

 

  

2017

 

 

2016

 

Finished goods

$

870

 

 

$

—

 

Work-in-process

 

1,642

 

 

 

1,803

 

Raw materials and supplies

 

18,242

 

 

 

18,388

 

Inventory

$

20,754

 

 

$

20,191