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Inventories (Tables)
3 Months Ended
Mar. 31, 2016
Inventory Disclosure [Abstract]  
Summary of Inventories

Inventories were as follows (in thousands):

 

     March 31, 2016      December 31, 2015  

Raw materials

   $ 17,292      $ 16,257  

Work-in-process

     3,050        2,879  

Finished goods

     3,808         4,306  

Net balance

   $ 24,150      $ 23,442