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Inventory (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventory

Inventory consisted of the following at June 30, 2018 and December 31, 2017 (in thousands):

 

June 30,

 

 

December 31,

 

  

2018

 

 

2017

 

Finished goods

$

2,462

 

 

$

2,270

 

Work-in-process

 

2,281

 

 

 

529

 

Raw materials and supplies

 

76,415

 

 

 

66,368

 

Inventory

$

81,158

 

 

$

69,167