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Summary of Significant Accounting Policies Segment Information and Signficant Customers (Details)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue, Major Customer      
Entity-Wide Revenue, McNair Medical Institute, Percentage 57.00%    
Document Period End Date Dec. 31, 2013    
Entity-Wide Revenue, Taconic Farms, Percentage 33.00% 68.00% 46.00%
Entity-Wide Revenue, Deltagen, Percentage   25.00%  
Entity-Wide Revenue, Texas AM Institute for Genomic Medicine, Percentage     20.00%
Entity-Wide Revenue, United States Army Medical Research Acquisition Activity, Percentage     20.00%