v2.4.0.8

Net Loss Per Share - Pro Forma Computation of Basic and Diluted Net Loss Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Numerator: |  |  |  |  |  |
Net loss attributable to Intrexon used to compute pro forma net loss per share, basic and diluted | $ 15,440 | $ (20,490) | $ (26,776) | $ (50,937) | $ (81,874) | $ (85,280)
Denominator: |  |  |  |  |  |
Weighted average shares outstanding, basic and diluted |  |  |  |  | 5,533,690 | 5,240,647
Add: Shares issued upon conversion of all Series Preferred |  |  |  |  | 61,368,058 |
Add: Shares issued upon conversion of cumulative dividends on all Series Preferred |  |  |  |  | 3,153,723 |
Weighted average shares outstanding used in computing pro forma net loss per share, basic and diluted |  |  | 83,738,320 |  | 70,055,471 |
Pro forma net loss attributable to Intrexon per share, basic and diluted |  |  | $ (0.32) |  | $ (1.17) |

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