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Investments (Tables) | 12 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Summary of Short-term and Long-term Investments | The following tables summarize the Company’s short-term and long-term investments as of September 30, 2018, and September 30, 2017.
| As of September 30, 2018 |
| Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Commercial notes (due within one year) | $ | 46,400,176 |  |  |  | — |  |  | $ | (429,050 | ) |  | $ | 45,971,126 |
Total | $ | 46,400,176 |  |  | $ | — |  |  | $ | (429,050 | ) |  | $ | 45,971,126 |
| 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 |
Total | $ | 40,769,539 |  |  | $ | — |  |  | $ | (334,755 | ) |  | $ | 40,434,784 |

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- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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