Selected Balance Sheet Information (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Current Assets [Line Items]
Intrexon prepaid research and development expenses	$ 1,163	$ 1,361
Prepaid insurance	121	177
Prepaid expenses	48	53
Total	$ 1,332	$ 1,591