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Fair Value Measurements - Additional Information (Detail) (USD $) | 3 Months Ended |  |  |  | 3 Months Ended | 1 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Dec. 31, 2013 Ablaris Therapeutics | Jan. 31, 2011 Unidym Inc | Dec. 31, 2013 2010 Warrants | Jun. 30, 2010 2010 Warrants | Dec. 31, 2013 2012 Warrants | Dec. 31, 2012 2012 Warrants | Dec. 31, 2013 2013 Warrants
Fair Value Measurements Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short term investments | $ 15,912,757 | $ 9,030,261 |  |  |  |  |  |  |  |  |
Long-term investments | 9,837,846 | 1,702,153 |  |  |  |  |  |  |  |  |
Total investments | 25,750,603 | 10,732,414 |  |  |  |  |  |  |  |  |
Fair value of investments | 25,533,387 | 10,698,271 |  |  |  |  |  |  |  |  |
Warrants issued to acquire Common Stock |  |  |  |  |  |  |  | 329,649 |  | 912,543 | 833,530
Warrants outstanding | 3,553,551 |  |  |  |  |  | 50,836 |  | 324,461 |  | 168,408
Non-cash gain (loss) from change in fair value of the derivative liability | 3,519,579 |  |  |  | 12,082 |  |  |  |  |  |
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 |  |  |  |  |  |
Change in value | 3,519,579 |  |  |  | 12,082 |  |  |  |  |  |
Acquisition related contingent consideration obligations | 1,595,273 | 1,595,273 | 173,621 | 173,621 |  |  |  |  |  |  |
Non cash consideration received in sale of interest in subsidiary, bonds |  |  |  |  |  | $ 2,500,000 |  |  |  |  |
Bond convertible conversion price per share |  |  |  |  |  | $ 2.00 |  |  |  |  |

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