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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands					6 Months Ended
	Jun. 29, 2015	Mar. 27, 2015	Feb. 02, 2015	Jan. 06, 2011	Jun. 30, 2015	Jun. 30, 2014
Related Party Transaction [Line Items]
Commitment to purchase common stock					$ 34
Stock buy back					$ 34
Md Anderson Cancer Center \| Minimum
Related Party Transaction [Line Items]
Ownership percentage					5.00%
Intrexon Corporation
Related Party Transaction [Line Items]
Commitment to purchase common stock		$ 43,500		$ 50,000
Percentage of commitment for payments from receipts of upfronts, milestones and royalties		50.00%
Stock issued during period			1,440,000
Stock buy back (Shares)	3,711
Stock buy back	$ 34
Share buy back discount on closing price	5.00%
Amounts paid for services incurred					$ 7,400	$ 5,600
Amount due to related party, current					$ 5,600	$ 2,200