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Fair Value Measurements - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Ablaris Therapeutics | Sep. 30, 2014 2010 Warrants | Jun. 30, 2010 2010 Warrants | Sep. 30, 2014 2012 Warrants | Dec. 31, 2012 2012 Warrants | Sep. 30, 2014 2013 Warrants | Jan. 31, 2013 2013 Warrants
Fair Value Measurements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Short term investments | $ 21,653,032 | $ 9,030,261 |  |  |  |  |  |  |
Investments | 23,088,346 | 1,702,153 |  |  |  |  |  |  |
Total investments | 44,741,378 | 10,732,414 |  |  |  |  |  |  |
Fair value of investment | 44,333,855 | 10,698,271 |  |  |  |  |  |  |
Warrants issued to acquire Common Stock |  |  |  |  | 329,649 |  | 912,543 |  | 833,530
Non-cash gain (loss) from change in fair value of the derivative liability | $ (5,821,796) |  | $ (211,860) |  |  |  |  |  |
Warrants outstanding | 1,490,589 |  |  | 24,324 |  | 265,161 |  | 12,123 |
Duration of exchange rights | 7 years |  |  |  |  |  |  |  |
Exchange right convertible conversion ratio for first year |  |  | 0.06 |  |  |  |  |  |
Exchange right convertible conversion ratio for second year |  |  | 0.04 |  |  |  |  |  |
Exchange right convertible conversion ratio for third year |  |  | 0.03 |  |  |  |  |  |
Exchange right convertible conversion ratio for fourth year |  |  | 0.02 |  |  |  |  |  |
Exchange right convertible conversion ratio for fifth year and beyond |  |  | 0.01 |  |  |  |  |  |
Number of exchange right sold |  |  | 675,000 |  |  |  |  |  |

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