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Common Stock - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Feb. 02, 2015	Jan. 13, 2015	Jan. 09, 2015	Feb. 17, 2015	Feb. 03, 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
Option to purchase common stock				1,500,000	1,500,000
Sale of stock price per share					$ 8.225
Net proceeds from issuance of common stock				$ 94.3