Summary of Significant Accounting Policies Segment Information and Signficant Customers (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
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%