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Investments (Tables) | 12 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Summary of Short-term Investments | The following tables summarize the Company’s short-term investments as of September 30, 2017, and September 30, 2016.
| As of September 30, 2017 |
| Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Commercial notes (due within one year) | $ | 40,769,539 |  |  | $ | — |  |  | $ | (334,755) |  |  | $ | 40,434,784 |
| As of September 30, 2016 |
| Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Commercial notes (due within one year) | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |

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