Collaborative and Other Agreements (Details Textual) (USD $)	3 Months Ended	12 Months Ended		1 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Mar. 31, 2014
Intrexon Corporation [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Payments for Royalties		$ 941,000	$ 357,000
Fees For Commencement Of The First Phase					2,500,000
Fees To Be Paid On First Regulatory Approval					5,000,000
Expenses Incurred Under Channel Collaborative Agreement	22,000
Cash Paid For Channel Collaboration Agreement	3,000
Collaborative Agreement Expiration Date	Dec. 31, 2014
University Of Leicester [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Payments to Acquire Intangible Assets		182,000	168,000
Expenses Incurred Under Channel Collaborative Agreement	50,000
University Of Glasgow [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Expenses Incurred Under Channel Collaborative Agreement	61,000
Walter Reed Army Institute Of Research [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Payments For Services Under Collaborative Agreement		207,000	309,000
Common Stock [Member] | Intrexon Corporation [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Stock Issued During Period, Value, Issued for Services				$ 3,000,000