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Inventories
3 Months Ended
Mar. 31, 2013
Inventories [Abstract]  
Inventories
3.  Inventories
Inventories consist of the following:
 
 
March 31,
 
 
December 31,
 
(in thousands)
 
2013
 
 
2012
 
Raw materials and supplies
 
$
2,565
 
 
$
2,733
 
Work-in-process
 
 
17,080
 
 
 
9,813
 
Finished goods
 
 
2,503
 
 
 
2,615
 
Total inventories
 
$
22,148
 
 
$
15,161