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Investments - Summary of Short and Long-term Investments (Detail) - USD ($) | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Commercial notes (due within one year), amortized cost | $ 14,431,498 | $ 17,539,902
Total | 14,431,498 | 17,539,902
Gross Unrealized Losses | (159,605) | (304,942)
Fair Value | 14,271,893 | 17,234,960
Commercial Notes Due Within One Year |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Gross Unrealized Losses | (159,605) | (304,942)
Fair Value | $ 14,271,893 | $ 17,234,960

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