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Investments (Tables) | 6 Months Ended
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Mar. 31, 2017
Equity [Abstract] |
Summary of Short and Long-term Investments | The following tables summarize the Company’s short- and long-term investments as of March 31, 2017, and September 30, 2016.
| As of March 31, 2017 |
| Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Commercial notes (due within one year) | $ | 24,910,492 |  |  | $ | — |  |  | $ | (130,319 | ) |  | $ | 24,780,173 |
Total | $ | 24,910,492 |  |  | $ | — |  |  | $ | (130,319 | ) |  | $ | 24,780,173 |
| As of September 30, 2016 |
| Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Commercial notes (due within one year) | $ | — |  |  |  | — |  |  | $ | — |  |  | $ | — |
Total | $ | — |  |  |  | — |  |  | $ | — |  |  | $ | — |

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