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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Summary of Inventories

Inventories are comprised of the following amounts:

 

     March 31,
2018
     December 31,
2017
 

Raw materials

   $ 38,151      $ 37,337  

Work in process

     32,124        27,669  

Finished goods

     21,284        17,611  
  

 

 

    

 

 

 

Inventories

   $ 91,559      $ 82,617