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Employee Stock Purchase Plan (Details) - shares | 12 Months Ended |
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Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Number of shares covered under the Employee Stock Purchase Plan (ESPP) |  |  | 250,000
Purchase price per share as percentage of fair market value | 95.00% |  |
Issuance of shares under employee stock purchase plan (in shares) | 32,222 | 29,238 |

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