Selected Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Current Assets [Line Items]
Intrexon prepaid research and development expenses	$ 643	$ 1,067
Prepaid clinical research organization expenses	8,329	0
Prepaid insurances	339	228
Other prepaid expenses	208	253
Total	$ 9,519	$ 1,548