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Fair Value Measurements - Additional Information (Detail) (USD $) | 6 Months Ended |  |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Sep. 30, 2013 | Mar. 31, 2014 2010 Warrants | Mar. 31, 2014 2012 Warrants | Mar. 31, 2014 2013 Warrants | Jan. 31, 2011 Unidym Inc | Mar. 31, 2014 Ablaris Therapeutics
Fair Value Measurements Disclosure [Line Items] |  |  |  |  |  |  |
Short term investments | $ 17,798,475 | $ 9,030,261 |  |  |  |  |
Long-term investments | 34,048,359 | 1,702,153 |  |  |  |  |
Total investments | 51,846,834 | 10,732,414 |  |  |  |  |
Fair value of investments | 51,563,458 | 10,698,271 |  |  |  |  |
Non cash consideration received in sale of interest in subsidiary, bonds |  |  |  |  |  | 2,500,000 |
Bond convertible conversion price per share |  |  |  |  |  | $ 2.00 |
Warrants issued to acquire Common Stock |  |  | 329,649 | 912,543 | 833,530 |  |
Warrants outstanding | 2,533,507 |  | 24,324 | 265,461 | 39,623 |  |
Non-cash gain (loss) from change in fair value of the derivative liability | $ 9,234,419 |  |  |  |  |  | $ 53,190
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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