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Inventories
6 Months Ended
Jun. 30, 2012
Inventories [Abstract]  
Inventories
3.  Inventories

Inventories consist of the following:

 
 
June 30,
  
December 31,
 
(in thousands)
  
2012
   
2011
 
Raw materials and supplies
 
$
2,740
  
$
2,313
 
Work-in-process
  
9,572
   
10,149
 
Finished goods
  
3,696
   
2,199
 
Total inventories
 
$
16,008
  
$
14,661