Common Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Feb. 17, 2015	Feb. 03, 2015	Feb. 02, 2015	Jan. 13, 2015	Jan. 09, 2015
Intrexon Corporation
Class of Stock [Line Items]
Stock issued during period			1,440,000
License Agreement | Ziopharm
Class of Stock [Line Items]
Common stock issued for cash				10,124,561
Cash consideration for license agreement				$ 50.0
License Agreement | Intrexon Corporation
Class of Stock [Line Items]
Cash consideration for license agreement				$ 50.0
Letter Agreement | Ziopharm
Class of Stock [Line Items]
Common stock issued for cash					1,597,602
Cash consideration for license agreement					$ 7.5
Letter Agreement | Intrexon Corporation
Class of Stock [Line Items]
Cash consideration for license agreement					$ 7.5
J.P. Morgan Securities Inc.
Class of Stock [Line Items]
Stock issued during period	1,500,000	10,000,000
Issuance & sale of common stock in public offering price per share		$ 8.75
Option granted, exercisable period		30 days
Sale of stock price per share		$ 8.225
Net proceeds from issuance of common stock	$ 94.3