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Commitments and Contingencies (Details) (USD $)
In Millions
12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Wake Forest Royalty Litigation [Member]
Loss Contingencies [Line Items]  
Royalty payments made under the licensing agreement $ 86
Amount Based Upon ZPIC's Audit Results5.8 
Amount Reduced To Based Upon Appeal$ 5.1