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Organization and Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Schedule Of Investments [Line Items] |  |  |  |
Cash and cash equivalents | $ 62,165,088 | $ 103,991,231 | $ 81,214,354 | $ 132,510,610
Investments | 14,431,498 |  | 17,539,902 |
Net increase (decrease) in cash | (19,049,266) | (28,519,379) |  |
Cash outflow related to continuing operating activities | (21,148,069) | (24,200,006) |  |
Proceeds from sale of marketable securities | 3,000,000 | $ 3,054,774 |  |
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 |  |  |

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