Selected Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Other Current Assets [Line Items]
Intrexon prepaid research and development expenses	$ 0	$ 643
Prepaid clinical research organizations	2,175	8,329
Prepaid insurances	75	339
Other prepaid expenses	547	208
Other current assets	294	0
Total	$ 3,091	$ 9,519