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Inventories
3 Months Ended
Mar. 31, 2012
Inventories [Abstract]  
Inventories
3.  Inventories

Inventories consist of the following:

   
March 31,
  
December 31,
 
(in thousands)
 
2012
  
2011
 
Raw materials and supplies
 $2,485  $2,313 
Work-in-process
  14,714   10,149 
Finished goods
  120   2,199 
Total inventories
 $17,319  $14,661