Stock Option Plans - Schedule of Stock Option Activity (Detail) (Intrexon Stock Option Plans, USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2014		Dec. 31, 2013
Intrexon Stock Option Plans
Number of shares
Balances at beginning of period, Number of shares	2,840,648
Granted, Number of shares	7,420,800
Exercised, Number of shares	(286,324)
Forfeited, Number of shares	(1,779,862)
Expired, Number of shares	(612)
Balances at period end, Number of shares	8,194,650		2,840,648
Exercisable, Number of shares	1,259,789
Vested and Expected to Vest, Number of shares	6,457,981	[1]
Weighted average exercise price (usd per share)
Balances at beginning of period, Weighted average exercise price	$ 8.27
Granted, Weighted average exercise price	$ 27.58
Exercised, Weighted average exercise price	$ (4.55)
Forfeited, Weighted average exercise price	$ (24.06)
Expired, Weighted average exercise price	$ (7.12)
Balances at period end, Weighted average exercise price	$ 22.46		$ 8.27
Exercisable, Weighted average exercise price	$ 7.99
Vested and Expected to Vest, Weighted average exercise price	$ 21.53	[1]
Weighted average remaining contractual term
Balances at period end, weighted average remaining contractual period	8 years 8 months 27 days		7 years 9 months
Exercisable at period end, weighted average remaining contractual period	5 years 7 months 6 days
Vested and Expected to Vest at period end, weighted average remaining contractual period	8 years 6 months 18 days	[1]

[1] (1)The number of stock options expected to vest takes into account an estimate of expected forfeitures.