Summary of Significant Accounting Policies Segment Information and Signficant Customers (Details)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Revenue, Major Customer [Line Items] | |||
Entity-Wide Revenue, Taconic Farms, Percentage | 68.00% | 46.00% | 35.00% |
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% | 23.00% |