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Investments (Tables) | 9 Months Ended
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Jun. 30, 2020
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 June 30, 2020 and September 30, 2019.
|  | As of June 30, 2020 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Commercial notes (due within one year) |  | $ | 67,709,263 |  |  | $ | 1,188,416 |  |  | $ | — |  |  | $ | 68,897,679 |
Commercial notes (due within one through three years) |  | $ | 177,529,881 |  |  | $ | 5,845,177 |  |  | $ | (14,833) |  |  | $ | 183,360,225 |
Total |  | $ | 245,239,144 |  |  | $ | 7,033,593 |  |  | $ | (14,833) |  |  | $ | 252,257,904‬ |
|  | As of September 30, 2019 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Commercial notes (due within one year) |  | $ | 36,899,894 |  |  | $ | 222,584 |  |  | $ | — |  |  | $ | 37,122,478 |
Commercial notes (due within one through three years) |  | $ | 44,175,993 |  |  | $ | 875,258 |  |  | $ | — |  |  | $ | 45,051,251 |
Total |  | $ | 81,075,887 |  |  | $ | 1,097,842 |  |  | $ | — |  |  | $ | 82,173,729 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269825-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 + Details
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