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Assumptions Used in Black-Scholes Option Pricing Model (Detail) (Intrexon Stock Option Plan [Member])
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12 Months Ended | |
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Dec. 31, 2012
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Dec. 31, 2011
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| Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Line Items] | ||
| Expected dividend yield | 0.00% | 0.00% |
| Expected volatility, Maximum | 76.00% | 72.00% |
| Expected volatility, Minimum | 71.00% | 68.00% |
| Expected term (years) | 6 years | |
| Risk-free interest rate, Maximum | 1.10% | 2.51% |
| Risk-free interest rate, Minimum | 0.80% | 1.34% |
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Maximum [Member]
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| Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Line Items] | ||
| Expected term (years) | 6 years 2 months 23 days | |
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Minimum [Member]
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| Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Line Items] | ||
| Expected term (years) | 5 years 4 months 13 days | |