December 31,
  
(in thousands)
  
2016
    
2015
  
                 
Raw materials
   $
8,057
     $
8,589
  
Work in process
    
1,531
      
1,529
  
Total inventory
    
9,588
      
10,118
  
Allowance for obsolescence
    
(278
 )    
(347
 )
Inventory, net of allowance
   $
9,310
     $
9,771