Selected Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Other Current Assets [Line Items]
Intrexon prepaid research and development expenses	$ 307	$ 643
Prepaid clinical research organizations	6,160	8,329
Prepaid insurances	224	339
Other prepaid expenses	425	208
Total	$ 7,116	$ 9,519