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Significant Accounting Policies (Details) - USD ($) | 4 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 07, 2019 | Sep. 30, 2017
Goodwill [Line Items] |  |  |  |  |
Amortization of acquired identifiable intangible assets |  | $ 2,700,000 | $ 1,800,000 |  |
Goodwill | $ 52,758,000 | 52,758,000 | 25,989,000 |  | $ 25,989,000
Goodwill impairment loss |  | 0 | 0 |  |
Uncertain tax positions | 0 | 0 | 0 |  |
Tax interest |  | 0 | 0 |  |
Tax penalties |  | 0 | $ 0 |  |
FDIC insurance limit amount | $ 250,000 | $ 250,000 |  |  |
Employee Stock Option |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Number of options that may be granted with a term of more than 10 years from date of grant (in shares) | 0 | 0 |  |  |
Expiration term of options |  | 10 years |  |  |
Minimum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Estimated useful lives of property and equipment |  | 3 years |  |  |
Maximum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Estimated useful lives of property and equipment |  | 7 years |  |  |
S3 |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Amortization of acquired identifiable intangible assets | $ 1,000,000 |  |  |  |
Goodwill |  |  |  | $ 26,769,000 |

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