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Inventories
9 Months Ended
Sep. 30, 2011
Inventories [Abstract] 
Inventories
4.     Inventories

Inventories consist of the following:

   
September 30,
  
December 31,
 
(in thousands)
 
2011
  
2010
 
Raw materials and supplies
 $2,118  $2,311 
Work-in-process
  13,663   7,917 
Finished goods
  2,198   2,494 
Total inventories
 $17,979  $12,722