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Out-Licensing Agreement - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 28, 2010 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Licensing Agreement [Line Items] |  |  |  |  |
Revenue |  | $ 10,000 | $ 133,000 | $ 222,000 | $ 543,000
Intrexon Corporation |  |  |  |  |
Licensing Agreement [Line Items] |  |  |  |  |
License agreement term (years) | 17 years |  |  |  |
Agreement one time fee | $ 350,000 |  |  |  |
Milestone payment amount |  |  |  | 0 | 0
Revenue |  | $ 5,000 | $ 5,000 | $ 15,000 | $ 15,000
Intrexon Corporation | First IND Filing |  |  |  |  |
Licensing Agreement [Line Items] |  |  |  |  |
Milestone payment amount | 50,000 |  |  |  |
Intrexon Corporation | First Phase II Clinical Trial |  |  |  |  |
Licensing Agreement [Line Items] |  |  |  |  |
Milestone payment amount | 100,000 |  |  |  |
Intrexon Corporation | First Phase III Clinical Trial |  |  |  |  |
Licensing Agreement [Line Items] |  |  |  |  |
Milestone payment amount | 350,000 |  |  |  |
Intrexon Corporation | Commercial Sale Related to Licensed Products |  |  |  |  |
Licensing Agreement [Line Items] |  |  |  |  |
Milestone payment amount | $ 500,000 |  |  |  |

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