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)