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Investments (Tables) | 6 Months Ended
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Mar. 31, 2019
Held To Maturity Securities Classified [Abstract] |
Summary of Short-term and Long-term Investments | The following tables summarize the Company’s short-term and long-term investments as of March 31, 2019, and September 30, 2018.
|  | As of March 31, 2019 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Commercial notes (due within one year) |  | $ | 56,560,674 |  |  | $ | 52,189 |  |  | $ | (162,798 | ) |  | $ | 56,450,065 |
Commercial notes (due within three years) |  | $ | 67,536,054 |  |  | $ | 703,472 |  |  | $ | — |  |  | $ | 68,239,526 |
Total |  | $ | 124,096,728 |  |  | $ | 755,661 |  |  | $ | (162,798 | ) |  | $ | 124,689,591 |
|  | 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 |
Commercial notes (due within three years) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Total |  | $ | 46,400,176 |  |  | $ | — |  |  | $ | (429,050 | ) |  | $ | 45,971,126 |

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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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