Stock Option Plans - Schedule of Stock Option Activity (Detail) (Intrexon Stock Option Plan, USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Intrexon Stock Option Plan
Number of shares
Balances at beginning of period, Number of shares	2,840,648
Granted, Number of shares	5,950,000
Exercised, Number of shares	(107,618)
Forfeited, Number of shares	(132,858)
Expired, Number of shares	(285)
Balances at period end, Number of shares	8,549,887		2,840,648
Exercisable, Number of shares	1,289,224
Vested and Expected to Vest, Number of shares	6,436,734	[1]
Weighted average exercise price
Balances at beginning of period, Weighted average exercise price	$ 8.27
Granted, Weighted average exercise price	$ 29.13
Exercised, Weighted average exercise price	$ (3.40)
Forfeited, Weighted average exercise price	$ (13.53)
Expired, Weighted average exercise price	$ (7.12)
Balances at period end, Weighted average exercise price	$ 22.76		$ 8.27
Exercisable, Weighted average exercise price	$ 7.37
Vested and Expected to Vest, Weighted average exercise price	$ 21.45	[1]
Balances at period end, weighted average remaining contractual period	9 years 2 months 9 days		7 years 9 months
Exercisable at period end, weighted average remaining contractual period	6 years 5 months 16 days
Vested and Expected to Vest at period end, weighted average remaining contractual period	8 years 11 months 27 days	[1]

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