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Inventories
6 Months Ended
Jun. 30, 2011
Inventories [Abstract]  
Inventories
2.  Inventories

Inventories consist of the following:

   
June 30,
  
December 31,
 
(in thousands)
 
2011
  
2010
 
Raw materials and supplies
 $2,171  $2,311 
Work-in-process
  11,872   7,917 
Finished goods
  3,219   2,494 
Total inventories
 $17,262  $12,722