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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |
Valuation allowance | $ 3,810 | $ 4,372
Income tax provision for Tax Cuts & Jobs Act of 2017 | $ 3,000 |
Tax Credit Carryforward [Line Items] |  |
U.S. capital loss carryforward |  | 2,900
United States Federal Tax Jurisdiction |  |
Tax Credit Carryforward [Line Items] |  |
Federal and state research and development tax credits |  | 3,100
U.S. capital loss carryforward |  | 2,600
Deferred Tax Assets, Other Tax Carryforwards |  | 100
Foreign Tax Authority |  |
Tax Credit Carryforward [Line Items] |  |
Non-U.S. operating losses |  | $ 200

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