Related Party Transactions - Additional Information (Detail) - USD ($)								1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 08, 2016	Sep. 28, 2015	Jun. 29, 2015	Mar. 27, 2015	Feb. 03, 2015	Jan. 13, 2015	Jan. 06, 2011	Jul. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Related Party Transaction [Line Items]
Stock buy back									$ 2,000
Research and Development Expense									10,199,000	$ 74,249,000
Research and Development Service Agreement Aggregate Quarterly Payments									3,750,000
Research and Development Service Agreement Aggregate Payments									15,000,000
Minimum
Related Party Transaction [Line Items]
Research and Development Expense						$ 15,000,000
License Agreement
Related Party Transaction [Line Items]
Research and Development Expense									$ 67,300,000		$ 67,300,000
Issuance of common stock in licensing agreement (in shares)									11,722,163		11,722,163
M.D. Anderson Cancer Center | Minimum
Related Party Transaction [Line Items]
Ownership percentage									5.00%
Intrexon Corporation
Related Party Transaction [Line Items]
Stock issued during period					1,440,000
Stock buy back (Shares)			3,711
Stock buy back			$ 34,000
Share buy back discount on closing price			5.00%
Company re-purchased additional shares	168
Company re-purchased additional shares Value	$ 2,000
Amounts paid for services incurred									$ 5,900,000	$ 1,700,000
Amount due to related party, current									$ 4,400,000		$ 4,600,000
Licensing fee		$ 10,000,000						$ 115,000,000
Commitment to purchase common stock				$ 43,500,000			$ 50,000,000
Percentage of commitment for payments from receipts of upfronts, milestones and royalties				50.00%