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Organization and Significant Accounting Policies - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 03, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Schedule Of Investments [Line Items] |  |  |  |  |
Cash to fund operations |  | $ 81,214,354 | $ 132,510,610 | $ 19,114,444 | $ 3,377,288
Investments |  | 17,539,902 | 44,741,378 |  |
Net increase (decrease) in cash |  | (51,296,256) | 113,396,166 | 15,737,156 |
Cash outflow related to continuing operating activities |  | (65,707,615) | (35,416,373) | (19,032,826) |
Cash payment for acquisition |  | 10,000,000 |  |  |
Capital expenditures |  | 1,970,612 | 1,717,362 | 296,880 |
Proceeds from sale of marketable securities |  | 26,090,950 | 11,591,120 | 1,419,079 |
Proceeds from the exercise of warrants and stock options |  | $ 504,512 | 12,878,044 | $ 2,057,178 |
Cash and cash equivalents, maturity description |  | three months or less |  |  |
Restricted Cash |  | $ 0 | $ 0 |  |
Amount insured in FDIC per account |  | $ 250,000 |  |  |
Minimum |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |  |
Maximum |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 7 years |  |  |
Commercial bonds |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Maturity description |  | less than 12 months |  |  |
Investments |  | $ 17,539,902 |  |  |
Novartis |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Cash payment for acquisition | $ 10,000,000 | $ 10,000,000 |  |  |

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