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Inventories
 12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Inventories

6.  INVENTORIES

Inventories as of December 31 were as follows (in thousands):

 

     2016      2015  

Raw materials

    $ 18,648      $ 16,257  

Work-in-process

      3,361        2,879  

Finished goods

      5,127        4,306  
  

 

 

     

 

 

  

Net balance

    $ 27,136      $ 23,442