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Investments (Tables) | 9 Months Ended
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Jun. 30, 2015
Equity [Abstract] |
Summary of Short and Long-term Investments | The following tables summarize the Company’s short- and long-term investments as of June 30, 2015, and September 30, 2014.
| As of June 30, 2015 |
| Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Commercial notes (due within one year) | $ | 23,280,640 |  |  | $ | — |  |  | $ | (207,165 | ) |  | $ | 23,073,475 |
Commercial notes (due after one year through two years) | $ | 1,085,282 |  |  |  | — |  |  | $ | (30,412 | ) |  | $ | 1,054,870 |
Total | $ | 24,365,922 |  |  | $ | — |  |  | $ | (237,577 | ) |  | $ | 24,128,345 |
| As of September 30, 2014 |
| Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Commercial notes (due within one year) | $ | 21,653,032 |  |  | $ | — |  |  | $ | (189,830 | ) |  | $ | 21,463,202 |
Commercial notes (due after one year through two years) | $ | 23,088,346 |  |  |  | — |  |  | $ | (217,693 | ) |  | $ | 22,870,653 |
Total | $ | 44,741,378 |  |  | $ | — |  |  | $ | (407,523 | ) |  | $ | 44,333,855 |

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