Settlement of a Related Party Relationship - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Oct. 05, 2018	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Transaction advisory costs recognized as expense				$ 2,000
Related party transaction, amounts of transaction		$ 207,361
Research and development expense			$ 38,331	34,134	$ 45,084
Preferred Stock Redemption Discount				207,361
RelatedParty Liability		$ 1,000	100	$ 1,000
Gorilla IL-12 Products
Percentage of development cost shared by other party	80.00%
Percentage of operating profit shared by other party	80.00%
Precigen
Annual Licensing fee			100
Intrexon Corporation/Precigen
Annual Licensing fee	$ 100,000
Reimbursement of historical costs	1,000
Preferred stock, contract liability, derivative liability	163,300
Increase in accumulated deficit	49,500
Related party transaction, amounts of transaction	212,800
Research and development expense			$ 1,000
Additional milestone payment for exclusively licensed program to be paid	52,500
Maximum Royalty payable	$ 100,000
Percentage of sublicensing income	20.00%
Royalty payment to be received	$ 50,000
Intrexon Corporation/Precigen | Gorilla IL-12 Products
Percentage of development cost shared by other party	20.00%
Percentage of operating profit shared by other party	20.00%
Third Party Vendor
Transaction advisory costs recognized as expense	$ 7,400
Series 1 Preferred Stock [Member]
Transaction advisory costs recognized as expense	5,400
Series 1 Preferred Stock [Member] | Intrexon Corporation/Precigen
Consideration transferred	207,300
Preferred Stock Redemption Discount	$ 5,400