Out-Licensing Agreement - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2010	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Licensing Agreement [Line Items]
Revenue		$ 10,000	$ 133,000	$ 222,000	$ 543,000
Intrexon Corporation
Licensing Agreement [Line Items]
License agreement term (years)	17 years
Agreement one time fee	$ 350,000
Milestone payment amount				0	0
Revenue		$ 5,000	$ 5,000	$ 15,000	$ 15,000
Intrexon Corporation | First IND Filing
Licensing Agreement [Line Items]
Milestone payment amount	50,000
Intrexon Corporation | First Phase II Clinical Trial
Licensing Agreement [Line Items]
Milestone payment amount	100,000
Intrexon Corporation | First Phase III Clinical Trial
Licensing Agreement [Line Items]
Milestone payment amount	350,000
Intrexon Corporation | Commercial Sale Related to Licensed Products
Licensing Agreement [Line Items]
Milestone payment amount	$ 500,000